n. , slang , avoidable A verbal contest between teen-agers in which the object of the game is to see who can be more disgusting or vulgar than anybody else. When Jim got home he found his two teen-age sons engaged in a gross-out session; he bawled them out and cut their weekly allowance.
GROSS-OUT SESSION
Meaning of GROSS-OUT SESSION in English
American idioms English vocabulary. Английский словарь американских идиом. 2012