Similar to saying "pound it" usually involves hitting of two or more clenched fists together in an expression of triumph.
Joms: YEA MAN! I JUST GOT ME A MONSTER!
HOMS: KNOCK THE ROCK!!!!!

*the rock is then knocked*
by TheRealJohnO December 14, 2004
To masturbate
Going job hunting today?
Nah, got a fifth of vodka, gonna watch yoga, and maybe knock the rocks a bit.
by Ziplin January 27, 2010

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