Top Definition
The act of over-extending one's jaw in order to fit a large busted girl's breast in your mouth.
"Wow, look at the rack on her...I wonder if i could put one of those in my mouth?"

"Yeah, if you could dislocate your jaw like a snake eating a rat; you'd end up getting boobjaw, I don't wanna have to come to see you in the hospital for that."

"But, it would be worth it, though."

"Idiot."
by the prince of prosciut' March 22, 2010

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