crap up

verb3

1. •
   (slang, vulgar) 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. — 1998
2. •
   (slang, vulgar) 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.
3. •
   (slang) To lie, mislead or give someone bullshit; to tell someone what they want to hear.