1 definition by stoned_philosophaster
Occurs when an unexpected guest knocks on your bedroom door when you are masturbating and about to orgasm, and you open the door and ejaculate on them, shouting "Surprise Party!" Common in college dormitories.
I knocked on my neighbor's door to ask him if I could borrow his scissors, and to my horror he appeared at the door completely naked with his hand on his penis and promptly ejaculated in my eye, shouting, "Surprise Party!"
by stoned_philosophaster December 2, 2007