BBQ stopper
n.— «I should explain exactly just what the phrase “BBQ Stopper” actually means. It’s Australian slang for a social incident or inappropriate comment that causes everyone at the BBQ to stop talking and look at you in a half-embarrassed, half-accusing kind of way.» —“Why would you want to stop a BBQ?” by Mr. Whippy BBQ Stoppers (Australia) Jan. 14, 2005. (source: Double-Tongued Dictionary)