Bukkake defined by Urban Dick as "mason jism line"

[torasan]

(noun) -- The area on a woman's body above which she is not okay with a man shooting their load after pulling out before climax during intercourse. Usually the breasts or upper-chest; a woman's acceptable cumshot boundary.

A verbal play on the mason dixon line that was the dividing line between the Northern and Southern states during the U.S. Civil War.

sample quote

Man: "She won't ever let me cum on her face."
Friend: "What? Really? What about on her tits?"
Man: "Yeah, she's okay with that- she just tells me to keep it 'below the mason jism line'."

http://en.wikipedia.org/wiki/Bukkake

http://www.urbandictionary.com/define.p ... id=5906373