One who gets sexual pleasure from the act of rubbing themselves against others in public. From the French, "Frottage."
Stop! Police! A puffin frotter!
by Addler July 19, 2006
To gain erotic pleasure from rubbing up against random strangers in crowded public areas.
When you feel somebody "Accidently" bump in to you or touch you and they "Apologize"... They are creaming their pants... That, my friend, is Frotterism!
by THe Funk Trunk Blumpkin Explosion (Rekanyze!) December 15, 2002