tide mark

the line on the arms from repeated fisting

he has tide marks from extensive fisting

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Thompson tide marks

The bloody smears left around a person's mouth after performing orals sex on a woman during her period. Named so, due to the bloody residue resembling the scum and water marks left on piers, boats and other structures after the tide has gone down.

Person 1: Oh shit, what happened to your face? You're bleeding!?

Person 2: What? Oh, no... my girlfriend is on her period and-

Person 1: She gave you the Thompson tide marks!? Disgusting! You can get HPV doing that.