Masturbating with oneself.
Greg: "Sarah, Jessica, and I had a three-way last night, son! What you do?!"
Josh: "One-way, dude. One-way."
Josh: "One-way, dude. One-way."
by ReyCHUL August 26, 2011
Get the one-waymug. Get the one-waymug. Get the one-waymug.