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1. head crabs
a comical way of saying head lice. the opposite of (but still very similar to) pubic lice.
Hey, thanks for letting me borrow your hat. There's only a small problem, though:
you gave me head crabs, ass-fuck!
2. head crabs
lice, bugs that live on your head
yo, don't go near that kid,he got head crabs.
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