Tongue Tanning, or “Tan Tongue” is the act of licking/and or tongue punching the asshole of someone male or female. It needs to be performed urgently after a fresh shit, as the goal is to coat and desecrate the tongue. letting the shit harden, giving the tongue a “Tan” look.. Laxatives may be necessary for better results and a “Tanner tongue”
Haley: Did you see how brown Brian’s tongue looked today?? What the hell is up with that?

Dan: Yeah he was tongue tanning last night.. he had his tongue deep inside Aaron’s asshole almost all night, giving him a tan tongue..
by Strenuous Bowels August 1, 2018
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