The act of cock-blocking oneself by saying something extremely stupid. When you don't need a cock-blocker - when you can do it all by yourself.
Danny was being hit on by some hot chicks at the bar but he said something so stupid he actually auto cock-blocked himself.
by Oscar12345 August 17, 2008
1 more definition
When you say something to the girl you are hitting on that makes you loose any chance of having sex with her.
Namyr can't get a girl because he's always doing autocockblocks.
by Francisco Garcia Gonzalez October 10, 2007