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2.
Makes you happy/horny/laugh or otherwise greatly affected.
You rock my face off!
Do you like Alkaline Trio? They rock my face off! Yeah I screwed Chris, he rocked my face off!
by Dsay Diane Nev October 24, 2003
 
1.
This means that it is VERY cool and I enjoy it much. :D
That horse rocks my face off!
by Phsyco biotch August 22, 2003