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1.
The act of masturbating with sandpaper. The grit is not important, but usually the lower the more hardcore you are.
Guy 1 - Dude I went to menards last night and posted up in the sandpaper aisle for at least 3 hours.

Guy 2 - Ah, good old road jerk I assume?

Guy 1 - Why else would the crotch of my pants be stained red?

Guy 2 - Well I didn't want to be rude and point it, but ya I noticed it you sick fuck.
by Mr.Meatspin January 07, 2012