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1.
-Noun
1. The act of thrusting one's hand through a friend, and or combat opponent's chest; causing a mortal wound to be inflicted on said target. The coin was termed from Tite Kubo's "Bleach," particularly from an act that character Grimmjow Jaegerjaquez performed on Luppi Antenor, after Grimmjow regained his arm after having it dissected by another superior. With his newly acquired limb, Grimmjow thrusts his hand through Luppi's chest out of defiance, declaring his victory over his once senior officer.

2. Definitely not an act of a sexual nature.
Damn I just wanna walk up to that bastard and shove my hand through his chest. He'd totally get a grimmjob if I wasn't so passive.
by Peace-Walker-Shiro November 05, 2010
 
2.
the act of having sexual relations with you're friends mother and/or the promiscuous activities of said friend's mother with an entire circle of friends. Often used as a form of antagonizing or punishment.
Lucky son of a gun got the Grimm job last night and came back smiling like an idiot.

If I beat you in this game of halo you're gettin' a Grimm Job
by Herry Ballsack April 12, 2010