Top Definition
Penis grating is when the teeth scrape along the penis during oral sex.
Boy: Ey dave that girl last night, Proper Toothy,
Boy: Oh yeah?
Boy: Proper grated my Penis!!
Boy: No way so she's a proper penis Grater??
Boy: Yeah Dude it was awesome!!
by HannahBean&JessicaThePleb August 04, 2008

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