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The sexual act of one partner inserting the big toe or thumb into the anus of a consenting partner and then placing the fecal matter released during insertion onto the forehead of the inserted partner. This will create an imprint resembling henna tattoo(s).
"She like my thumb up there, but I REALLY made her hot when I gave here a Dirty Henna Tattoo!"
by Breadbowl May 26, 2009
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