(transitive, slang, idiomatic, mildly, profane) To ruin, botch, bungle; to make a mess of.
This whole thing's his big, bright idea because they don't like having me around crapping up their big, romantic weekends.
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(idiomatic, slang, mildly, _, profane) To go wrong; to foul up; to make a mistake.
I really crapped up on my fucking school work, so I had to do that frustrating piece of shit all over again.
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(idiomatic, slang) To lie, mislead or give someone bullshit; to tell someone what they want to hear.
This whole thing's his big, bright idea because they don't like having me around crapping up their big, romantic weekends.
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Add your own interpretation of "crap up".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.