To eject the contents of ones stomach through their mouth into anything other than a toilet. Frat boys may know as a sign that they are sure to get some tonight.
"...and as soon as she put it in her mouth she Vom-Bomed inside my pants. No, but realy guys... what a rocking body; that was a night i will never forget."
An exaggeration on the word “vom” (slang for vomit), normally a retort to something that makes you feel like vomiting a bucket's worth - figuratively of course.
Karin: "Look, over there! That building is the Korean Couples Cinema, only couples can see films there."