a. When someones jaw muscles are sore from giving blowjobs all day long they get cramped up and their mouth hangs open without showing any teeth.

b. When someones mouth is open forming a perfect O, showing little or no teeth.
Dude, shut your mouth man, you look like you got a blowjob cramp!

Shuttup man, did you just see that girl? she was HOT!!!

yeah, but she saw your mouth open and kept on going didn't she?
by hypo April 17, 2008

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