When you take a towel and hold on to each end. Putting the towel in between your legs and moving it to the front and back (like you are flossing your teeth, but instead its your balls/crotch)
My balls were dripping wet after a shower so I towel flossed them.
It's when you take a massive dump over your towel. You wait for it to become dry and crusty so you can wipe it off the towel so you can sculpt it into a anime body pillow.
Mom: Niggato what are you doing in there?
Niggato: I'm masterbating to my towel feces! Don't look!
A small wash cloth or hand towel that is kept next to the bed, in the glove box or in a pocket and is used for cleaning up bodily fluids after a sexual encounter. It may have a smiley face drawn in a corner so that the Happy Towel will not be accidently used for other purposes. This towel might also be used for a woman to spit into if she does not have the decency to swallow.
After their passionate encounter, Dick and Jane used their Happy Towels to clean up the mess and the wet spot. happy towel clean up body fluid
When it becomes necessary to exit a chick's apartment via the window because you realized too late that you are drying your ass and junk with her "guest towel" after bangining the shit out if her"
I wasnt paying attention and i had to make a guest towel get-a-way. Man I dont know which i left messier, her or her goddam linens.