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grimey-ass grin 

A facial expression expressed by a man or woman who has been discovered recently engaging in an illicit or private activity, usually appearing delighted.
Jason woke up later in the afternoon, and saw his house mate and some young woman on the couch roused and mussed up with grimey-ass grins on their faces.
grimey-ass grin by Young Scain June 23, 2007

Grimey Ass Hoe 

A girl who is nasty as hell, has had sex with 20+ guys and has a kid. Girl, you're a grimey ass hoe.
Grimey Ass Hoe by dagirluluvtah8 October 14, 2010