Ground hog grease
The skid mark found in one's shorts after one refuses to defecate when one should.
Barbara: I had to shit so bad, but I didn't want to log off facebook.
Sue: So what happened?
Barbara: When I finally logged off, I found some ground hog grease in my panties.
Sue: So what happened?
Barbara: When I finally logged off, I found some ground hog grease in my panties.