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A common prank resulting in the victim attempting a blind-folded situp and encountering the perpetrator's ass at the apex of the situp.
Bart wanted to impress his friends with his ability to achieve at least one situp while resisting the force of a towel pinning his head to the ground by a buddy. Before he knew it, his nose was cheek deep in ass and he realized he had actually performed a shitup.
by white polo and jeans July 27, 2012
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2
British prison officer's slang for an inmate seeking attention by smearing his cell with excrement.
Wow did you see that shit-up in Block 9 this morning? I pity the cleaners.
by Gruntyface July 13, 2010
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3
To shit someone up is to scare the shit out of them.
To be shit up is the state of being scared shitless.
"don't be shitting me up"
"lets go and shit em up"
"we shit em right up"
"they were shit up, so they shit out"
by Bitplane January 22, 2006
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5
When your keyboard autocorrects shut up to shit up.
(Texting) Person 1: "Hey dude why don't you shit up?"
Person 2: "Don't you mean shut up?"
Person 1: "SHIT UP!"
by NaniKoreWa June 17, 2018
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6
when a huge dump comes flying out your dunghole so fast that you are lifted off of the toilet seat
Guy: Oh shit here it comes!

'turd shoots out like a bottle rocket'
'guy's head gets stuck in ceiling'

Guy: Damn i hate doing those shit-ups.
by swamp thing November 16, 2005
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7
Working out vigorously with full bowels, then trying too hard to get that 'last' sit-up. At least your whole anus didn't pop out, like has happened to some unfortunate weight lifters.
Weight lifter: *pant* *pant* uuHHUNNGHHT! *sploosh*
Random hot girl walking by: Aww gross... did you just shit-up?
by beep beep bitch! March 05, 2007
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