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The middle finger of Metal heads.

The rock on sign upside down. Given as a rude gesture to mostly people wearing Slipknot shirts, and shirts of other gay Metal bands. It is basically saying the opposite of "Rock on".
I saw this kid at the mall in a Slipknot shirt, and I gave him the upside down rock on sign. Then he ran away and cried.
by joe725 August 05, 2007
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