Someone who pretends to be your friend but in actuality keeps you around as a last resort and makes plans with YOU but THEY end up not showing or even calling to say their not coming. Usually their always late and have an excuse for everything, most likely this person is a pathological liar as well.
First scenario:

Friend #1 "What time is dego getting here?!"
Friend #2 "Psh he ain't coming, dudes a flake!"

Second scenario:

Flakey individual: "Hey we never hang out, lets do something Sunday!"
Bitter friend: "Ok sure dego" (rolls eyes)
by Erizzle82 June 1, 2010
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Slang. Adjective. Flake is a title applied to people who exhibit "flakey" behavior, which is simple unreliability in regards to social responsibilities. General unreliability includes flakeyness, but involves more; a flake merely fails to recognize their social responsibilities to others, while an unreliable person will often disappoint even themselves. This term also sometimes applies to professional unreliability, where the work involves some social element, resulting in an unfair responsibility distribution.

This can be caused by a wide variety of factors, including laziness, selfishness, a lack of respect, or a variety of manipulative personality disorders.

It is important to note that genuine inability is not actual flakeyness, and the assumption of such is an act of ignorance. A person who is not a flake will consider the consequences of their inconsistency, make a reasonable attempt to inform those it affects as early as possible, and likely attempt to make amends for their failure at a later date. A person who actually has some disability affecting their memory is also not a flake; irresponsibility is not their choice.
Jack and I were told to rake scrap from the work yard. Jack was fine before that, but suddenly got sick and had to go home. Then I had to do it myself. That flake came to work the next day just fine.

Jill asked Tom on a date to see a movie, and Jack agreed. Tom never showed up and wouldn't answer any calls. When she asked him what happened in person, he said he forgotten he had to play poker that night. The flake also missed our poker game.
by Kydo July 29, 2015
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Flake is a particularly potent/strong cut of cocaine. It will be more expensive but the high is cleaner and lasts longer. You'll still end up doing the whole bag though.
'Flake is £50 a gram but much better that the 30 bags'
by The taxi man November 26, 2016
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A Flake is someone who can think of any excuse not to show up to an event. They usually have little or no friends because they never show up to hang out. they are fuckin cunts on wheels who will bail on you at the last minute so they can just sit on thier fat ass an rub one out. Abondon all hope of ever being good friends with a flake. They cause nothing but anger an wasted money on gas an beers.

A Flake may call at the last minute to tell you he or she will not be attending the event or most of the time they wont call at all leaving you sitting there by yourself, looking like a real jerk off. They rarely, if ever admit to being a flake an usually stick to thier excuse that they had something more important to do.
Drew: "Hey are you still down to go to Vegas?!?"

Garrett: "Naw dude I cant, I got a paper to write"

Drew: "BUT ITS SPRING BREAK! Youre such a fuckin flake!"
by llegoz October 16, 2009
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A flake is an insincere person. Insincere in anything they say or do.
Text from Tanya> hey bud let's meet out!
Text from Tanya> we be clubbin' 2nite woohoo!!
Text from Tanya> let's do this!!!

<Reply> OK let me know when you get there.

Text from Tanya> B there in 10 minutes.

....Half-hour later
<Reply> I'm here. Where the hell are you?

........Hour and 1/2 Later
<Reply> WTF? Thanks a lot.

Text from Tanya: Couldn't make it my pants ripped.

<Reply> OK next time keep your fat ass at home instead of wasting my time, Flake!
by What matters September 17, 2009
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A FLAKE is ONLY when a person does NOT inform the person/parties AHEAD* of time that he is unable to make the engagement. On dates, people get STOOD UP. At events, he is considered a NO-SHOW.

Later, flakes generally give lame excuses for their absence or attempt to ignore their behavior altogether.

* A flake is NOT necessarily someone who is LATE or someone who informs the party ahead of time that they are unable to make the event.
Ya know, Bob is such a flake. He coulda (at least) called to let us know that he wasn’t gonna show up.”
by MNMaxCat April 6, 2020
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to quit commitment at the last second, not showing the responsibility of keeping a promise
Darn, @6_resell flakes on me again...
by Jellygrape February 25, 2019
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