A fork of Rural Dictionary
Slang for thong in the sense that the thong acts as a type of 'floss' within the crack of the person wearing it.
"this buttfloss feels like I have a constant wedgie"
The act of taking a towel or shirt you never want to use again and clean your butt crack. Usually in a dental flossing type motion. Really cleans out the butt.
Dude I have the worst case of swass, I am going to have buttfloss this shit...