twatmouse Share definition Flag A Term used to describe a tan line, with an outstanding definition between tan and unexposed skin. Thats some serious twatmouse you've got there pal, you look like a zebra with 2 legs..... twatmouse by peter uddle November 7, 2012 0 0 Get merch Get the twatmouse mug. Buy Now — $32.95 See more merch