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a guy that screws (has relations) with many many women.
or in other words a 'male slut'
bob: "Fuck Joe how many girls you do this week?"

Joe: "Not many Bob, only 10."

Bob: "(laughing)..you cunny hopper."

Joe: (winks)
by knifer May 22, 2008
Someone who pisses you off when they jump a line. Not gender specific.
"There I was, lined up for the can, and this cunny hopper came out of nowhere and butted in front of me. Arsehole!"
by Iggy6471 October 12, 2008