1. (n.) A result of a friend, stranger, or acquaintance making sexual relations or intercouse impossible (by accident or purposely) with a member of the same or opposite sex.
2. (v.) To make the act of having sexual relations with a member of the same or opposite sex impossible (by accident or on purpose.)
1. "Last night I was chillin' wit Shorty at a party, when some dude walked into the wrong room and she didn't feel like doin' it no more...I was an unfortunate victim of cock-block.
2. "Last night I saw James tryin' to hook up wit Jenny and he knows I like her! So, before she left wit him to the other room, I told her that he has Herpes. Next time I talk to him I'm sure he gonna wanna kick my ass for cock-blocking him."