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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.
"deez nuts in your mouth hahahaha"
"boy BIYM"
"what..."
"BALLS IN YOUR MOUTH HAHAHAH"
BIYM by asherinalol February 17, 2022
Related Words
Balls in your mouth
“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?
biym by Ibeliveinjustice January 8, 2020
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