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When you're scratching your ass and find a stray hair, and as you pull it out you realize it's actually in your arsehole, like floss, but up your ass.
It was so embarASSing when I yanked that flass out during my threesome with Earl and Lorlene.
To floss someone's posterior crevice. See "flassing."
He seriously needs to flass; his BO is unbelievable!
Treating a girl like shit in order to manipulate her into finding you attractive, at least for a day or two. You completely disregard the females feelings to control her.
Sohil, you were flassing too hard back there, I thought she was going to slap the shit out of you.
Person 1: "Oh my goodness look at that skinny bitch!"'
Person 2: "Haha, yeah, look at the flass!!!"
Simply when one has a flat ass. Hence Flass.
That girl has quite the Flass!
Glasses that do not contain prescribed lenses, usually found on the shelves of your local Dollar General. worn by women who want to look sophisticated or cop out of putting on make-up/doing hair.
"check her out, she is totally sporting flasses"
"those can't be real, they are deffin. flasses!"