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2.
1. Someone's head.
2. to "twist someone's beercap" is to confuse them or mess with them mentally.
"Ni**as is strapped, and they tryin' to twist my beercap" ~Method Man
by Jazzy Jizz February 02, 2006
 
1.
Beer Cap is a phrase that Method Man uses to mean his head or mind. Twisting your beer cap means messing with your mind
"these fools are fuckin with me and tryin' to twist my beer cap."
by G TrickP August 19, 2006