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Bulk is the scrotum and skull is the penis. This is a reference to the "comedic relief" characters from the original Power Rangers series. Bulk is the scrotum because he's fat. Skull is skinny so he's the penis.
Teddy's short shorts revealed his bulk and skull.

He slipped while grinding and totally smashed his bulk and skull.

Careful not to get bit by fire ants on your bulk or skull.
by Sean Manning September 03, 2005
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