Doing everything you said you wouldn't, and never doing all the things you said you would.
"Why does John always blow us off for school now? He never used to be like that."

"Dude, he's growing up."
by TCT1 April 20, 2010
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That thing you've got a whole lot of to do.
Me: grow up
You: 🙄
by LiberalDestroyer007 November 16, 2018
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Grow up is phrase said to people who are acting like a bit of a chump and need to act their bloomin' age.
"Ha, ha! Look at me - "

"Grow up! You juvenile bastard!"
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Definition : marry the blonde you love
I need to grow up
by Des monald October 6, 2015
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Something somebody doesn't have to do if they have reached a certain age and haven't done so already.
If somebody is 40 years old and still a child, that's their business. They don't have to grow up if they are still alive and still a child at the same time.
by Solid Mantis April 27, 2021
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When a person learns to stop

Playing videogames (especially with Nintendo)
Being a follower (get a unique persona)
Wasting their time on Facebook (Facebook is boring, you no life)
Acting ghetto (includes dressing ghetto and speaking ghetto)
Saying words like "dude", "nigga", "noob", etc. (believe me most people I know who use these words are unsuccessful in life)
Making their parents mad (learn to respect your parents)
Being a fucking asshole (stop making people upset)
Fantasizing about their relatives (you know you thought dirty about a relative, stop lying)
Being patriotic (if you think this country is the best in the world, you probably never traveled to other countries)
Eating kiddie food (ravioli,grilled cheese with American cheese,etc. )
Waking up late (the more early you show up, the more money you earn)
Sharing things like clothes, shoes, cosmetics, etc. brothers/sisters (buy your own shit)
Using a cheap phone (get a fucking smartphone/android)
Caring about gossip (shut the fuck up and mind your own buisness)
Talkin lik dis(are you retarded or something?)
Dressing like a fruitcake (fucking weird)
Eating fast food (you know the people who like McDonalds right?)
Stop being one of the "popular" kids (most "popular" kids usually end up being losers)
Being lazy (self explanatory)
Getting acne breakouts (get Proactiv already)
Taking a bath (only take baths when you´re with someone else)
Being a pussy (get some confidence)
etc.
Bob: What the fuck happened to J? He doesn´t want to play videogames anymore!

Mr. Mann(teacher): He´s growing up. I could see him getting a mansion, beautiful wife, being successful for the rest of his life, and passing it down to his kids. You should look up to him.

Bob: Cool story bro, I´ll ask him on Facebook

Mr.Mann: He told me he deleted his Facebook

Bob: Shit he did! I guess he IS growing up...
by I´mYoGrandpaSoListenUp February 26, 2012
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Means that people think that you are pathetic and you need to grow up otherwise ur just gonna get bullied even more and they will keep nugding you !
Bully: Omg ur so lame grow up !!
Person:no why don’t you

*boom* the person gets Beaton up
by Xxxmegs.bxxX December 10, 2019
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