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3. shit-up
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.
1. shit-up
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?
2. shit-up
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.
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