1) The prevention of a potential hook-up. Either done by a jealous friend/
douschebag, or by an overprotective friend (Mother Hen) of the girl involved in potential hook up. (see
game killer.
2) The act of "cutting" at a
4-way stop sign and "cock-blocking" someone who has waited thier turn at a stop sign.
Example:
1) Guy 1: I'd really like to see you again.
Girl 1: I don't have to go home tonight.
Guy 2: Hey Carl, remember that time you shit yourself?
Girl 1: Ummm... I have somewhere to be...
2) This dumbass in a
drivers ed car just cock blocked me at
the stop sign. So I
tailgated the fucker till he ran of the road, it was my turn at the stop sign, he needs to learn his place.