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.
The act of doing something so incredibly stupid while trying to get with a girl that it ruins your chances with said female.
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Auto-Cockblock Asphyxiation:
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At the party, Mark was hooking up with this girl. When he tried to ask her to come back to his place, he couldn't remember her name. She got so pissed, she stormed off. He totally auto-cockblock asphyxiated himself!
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Everything was going great with Lauren untill we got in the cab. We were making out in the back for a few minutes when all of the sudden I got the spins real bad from all of those tequila shots. I tried to hold it back, but I threw up all over her. Now she won't answer any of my calls or texts. I completely auto-cockblock asphyxiated myself!
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.