v. phr. , vulgar , avoidable To spoil someone's pleasure or celebration by doing or saying something harsh or unseemly in an otherwise happy gathering; bring up depressing or unhappy subjects at a supposedly happy time. Stuart really spit into the wedding cake when he told Burt in a bragging fashion that Lucy, Burl's bride, used to be his girlfriend.
PISS INTO THE WEDDING CAKE
Meaning of PISS INTO THE WEDDING CAKE in English
American idioms English vocabulary. Английский словарь американских идиом. 2012