go to shit

rude slang To deteriorate or go awry. Boy, this party has really gone to shit. First, there was the issue with the caterer, and now half the guests aren't coming. Their marriage eventually went to shit after he discovered that his wife was having an affair. I thought I would be able to get a lot of people to sign my petition, but things have really gone to shit now. I'll be lucky if I can scrounge up 10 signatures!