BSOC 

The sound and action of having a male's testicles slapping off of a women's vagina.
Balls
Slapping
Off
Cunt

Man i was hitting this girl so hard last night my roomate told me he could hear the mad bsoc through the wall.

BSOC by Matt English April 18, 2005

BSOC 

like BNOC, BSOC is an abbreviation used across universities for "Big Slut On Campus"

"have you licked out Kelly yet?"
"yeah man, she's such a BSOC"

BSOC by manchestermetsucks January 14, 2015