1 definition by Sha-Shameless
Any type of residue remaining on/in between the crack your behind after using the bathroom. This includes feces, TP, blood, semen...or whatever else you're into...
I took off her G-string, and homegirl was rockin' some Cheek Wheat...I guess that defines butt-floss.
by Sha-Shameless July 26, 2010