A person who prevents a friend from layin' down his game or lays down game on a female that he KNOWS his friend is into, just because he can. See Cockblock or SlickD.
by Gaetani April 20, 2003
Typically a female, but can be a gay male too. One whos a total prude, and refuses to do any sexual thing with a guy, "blocking his cock."
"Thats her man, shes the one that i begged and begged for the last week, and still ain't got shyt outta!"
by The walking naughty!! July 07, 2005