Ultimate Cock Block 

When your room mate is about to score with a girl, cover your ass in chocolate sauce and run into the room naked yelling "damnit we're out of toilet paper!!! I gotta wipe my ass!!"

Dude, my asshole room mate did an ultimate cock block on me!

Ultimate Cock Block by currybomb July 29, 2010

ultimate cockblocker 

someone who hits on his friends girlfriends. spends too much time with other peoples girlfriends. kisses hugs and those generally inappropriate things with his friends girlfriends .

Paul: Stephen is the ultimate cockblocker

tom: so true

ultimate cockblocker by orion_14754 June 2, 2010