what is the “Wop-a-Cop”？
t's a place to enter warily. You know Crooked Kenneth? He gradu¬ated there, and it's said that's where the Wop-a-Cop gang learned their arts.

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I think this is very context dependant. Probably from a movie? or a book?

anyway, I am not familiar with the gang.

Wop can have a few meanings, but I think it means 'hit' in this context. Cop means policeman.

Therefore the gang is called wop-a-cop to suggest that their primary activity is assaulting / hitting policemen

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