Pop culture euphemism for;
1. Person(s) who kills a good mood, fun killer, party pooper 2. Bringing a highly inappropriate item ill suited for the situation.
Based on this ridiculous account;
"In Fargo, N.D., a man, 33, reportedly stabbed another man, 37, during a threesome. The stabbing allegedly occurred when one of the men reportedlyrefused to switch positions during the sexual romp."