“Smurfing” is the erotic practice of tying spare dental floss around the base of an erect penis, and waiting for it to subsequently become a bluish black hue, similar to that of a Smurf (a fictional blue troll-like character) this process is completed with an intense masturbation session while laying down, completing this smurf-like look by covering the tip in semen, resembling the hat of a Smurf.
“Dude she was so bad”
“I know bro I’m gonna try Smurfing to her tonight”
“Whatever tickles your pickle man, but don’t tie it too tight”