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1.
a social vampire of sorts. a guy who is so desperate to have sex that he will do anything within his power to make sure that you don't.
Man, I was at the bar the other night getting ready to take Susan home, when all of a sudden Ron, the "Cock Blockula" steps in with a story about his dog dying!
by bradlay July 10, 2008
 
2.
Someone who at every chance sucks up all the game in the room at his friends expence.
John: Aye there were like 100 girls at that last night, did you get any action?

Ryan: Not at all Gary was being such a Cockblockula! Dude he totally kicked off the Cockblocalypse.
by P.S. Foolish June 13, 2011