Top Definition
1. A straight female that has something about her that automatically prevents her from getting sex.

2. A straight female that always says or does something stupid that prevents her from getting sex.
1. Stacy has a mustache thicker than her boyfriend's. She's not gonna get laid; that's a turnoff. She's an auto-cock-blocker.

OR

2. Tracy is so pretty, but she's weird! She says random stuff like "my hamster talks to me at night." When boys hear that, they freak out. She's an auto-cock-blocker.
by PrincessR December 08, 2009
5 Words related to Auto-cock-blocker

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