Person 1: Hey, I wanted to talk to you about last night...
Person 2: Hey, you know what? BIYM! Okay? Last night never happened.
Person 2: Hey, you know what? BIYM! Okay? Last night never happened.
by K Wheezle May 26, 2004
BIYM stands for Balls. In. Your. Mouth. Its the perfect comeback and is always fun to use and say with your friends or even your parents.
by asherinalol February 18, 2022
“My newest Tinder hookup frequently verified with me that he wasn’t crossing any boundaries, and I was all for it; until, he mentioned biym. Not a fan.”
Or
Did the biym trick work with your boyfriend?
Or
Did the biym trick work with your boyfriend?
by Ibeliveinjustice January 9, 2020