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1: Reduce (something, someone) to small shreds.

2: To gruesomely scar or injure ones face off a rough surface.
Diarmuid fell off his bike and Cheese-grated his face off the road.
by SlimsLynch April 24, 2011
When one is under the influence of alcohol, and is dragged across the floor until there ass is completly red, or "cheese grated"
" YO sierra your ass in so red. dude,you got Cheese-grated."
by yahay February 12, 2008