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When a female with an incredibly big butt chin, puts a penis in the crack with a little lubericant (usally spit, baby oil, or non-scented lotion) an does and up an downward motions thus making the penis ejaculate all over the females face.
Trey: Hey did you hear?
Alex: Hear what bro?
Trey: Ashlyn gave Luke a chinjob, and he had to be rushed to the ER.
Alex: Oh. Wow what thats awful, but those are very dangerous.
ChinJob by DattHott October 12, 2012
Related Words

chinkobot 

An asian robot that looks exactly like a real asian human. They are extremely smart and can do calculations on internal computers.
That chinkobot is so smart! she gets 100 on every test without even studying.
chinkobot by chinkobot3000 November 18, 2009
The act of putting butter on a girls chin, placing ur penis on their chin, pulling their chin fat around ur wang, and then thrusting back and forth until ejaculation.
Mrs. Denntt gives a rather swell chinjob.
chinjob by Wesleey July 3, 2006
The act of rubbing ones chin vigorously on anothers dirty crack, giving a goatie beard type effect.
Hey Daz, call that a goatie? Looks like you've been giving Jamie a chinjob.
chinjob by Jimbo August 27, 2004