The marks left on a shaft after pounding a hairy dry pun or mussy.
Man, look at dem grill marks she gave me.
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When you burn the living shit out of your bud after hard roast sesh.
Chad-Dude, John over there has some hard ass fuggin grill marks after yesterday.
Trevor-No way bro, actually.
Chad-Yah
When you've been rubbing one out for too long, and it leaves a mark.
"Ow, take it easy Stacey. I went too hard last night and now I got grill marks."