A slapping of one's head with an open hand or penis. In order to successfully complete a slap upside the head, the slap must be in an upward motion. The point of contact is usually on the side of the head or occasionally, towards the back and always around the ear. These types of slaps are brought on by those who something completely idiotic, who just don't get it, who owe money or just don't know how to listen. This variation of the slap is not meant to physically hurt, just insult/demean them and hurt their feelings becuase they are a complete moron or they owe you a lot of money. It can also be used as a type of dick slap meant to put your bitch in her place.
Example 1 -
Him - "Hey! I can't believe my bike just got stolen."
Me "Oh my god! How did that happen"
Him "Well, i left it in the alley and didn't bother to lock it"
Me "You are stupid and will need to be slapped upside the head."
Example 2 -
"My dear, I must say today's ball-sucking session is quite subpar and may call for dick slap upside thy head."
by Frarah October 4, 2007
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The best sex you will ever have. In other wards, shagging spontaneously.
Lacey: Wow you must really like Dan.

Stacie: Ye.

Lacey:Wow, did you do the upside down disco with him Stacie?You've known him for awhile.

Stacie: Hell ye, it was good.
by browngirlsdonttakebs November 3, 2008
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1)Additional ownage, said immediately prior to or while slapping or hitting someone.
2)Where that bitch is gonna get slapped.
3)An alternative to "Upside your head".
Bitch: And you know what else is your fault? That--
Perry: (slaps Bitch) Upside your face, bitch! Now shut the fuck up... and go make me a sandwich!
by WelcomeToNowhere April 18, 2010
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When you do a handstand on the toilet and then proceed to take a shit. Thus letting the shit slide down your body and lastly, off your face into the bowl of water.
Guy: why he got a turd streak on his cheek
Dude: he just did an upside down poop
by godsbutthole October 23, 2013
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To extend your arm so that your hand is below the back of a person's head and thrust your hand upwards so that your palm hits them square in the back of the head.

This is typically done when someone does something stupid or just to humiliate/annoy them.
When Rose started to take diet pills, her mother gave her a smack upside the head to knock some sense into her.

As John sat in the passenger seat, the driver acted like her was streching, but really smacked John upside the head and hillarity ensued.
by ByRd May 8, 2007
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A Grade so bad you turn it over right when the teacher hands you your paper.

Upside down grades tend to happen only with people who have their identity in high academic achievement.
Guy #1: Hey, did you see what Michelle got on her math quiz?

Guy #2: No, she flipped it over really fast.

Guy #1: HaHa!! Looks like Miss 4.0 got an Upside down grade!
by Dr. Trevorkian November 29, 2009
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An expression of either great pleasure or great frustration.

To do the gesture, you should first open your hands in front of them with their palms facing upwards. After that, wiggle just your fingers. That's how you do the upside down keyboard.
-Good upside down keyboard-
My favorite band, Grown Ups, are playing ten minutes away on my birthday, * performs upside down keyboard*

-Bad upside down keyboard-
Player 1: Checkmate.
Player 2: *performs upside down keyboard*
by nightlifecommando June 17, 2011
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