Refers to particularly deep or rough sex. Implies that the man will literally knock vaginal walls down.
I'm sorry, Mandy can't come to the phone, I'm too busy knockin' the bottom out of it.
by ray<3 October 18, 2008
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bottom knockin'

The verb form of "Knockin' the bottom out of it". (Refering to rough sex with a woman)
-Also see, beat her guts up.
"Sorry I didn't pick up my phone last night man, you cought me right in the middle of bottom knockin'.
by ray<3 October 20, 2008
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