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