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Smashing butt cheeks

The act of sex in which a man enters his lady friend from behind and as he thrusts he smashes her lovely butt cheeks.
Yo, Tommy Gun, Liz and I were smashing butt cheeks in my dorm room when my suite mate walked in!

Cheek Smashing 

When you press your weiner between a girls butt cheeks and thrust till ejactulation. (Titty fucking of the ass cheeks) Usually occurs in high school.
John's girlfriend wouldn't have sex with him last night so he resorted to cheek smashing her.