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1.
The towel somone uses to do that butt-flos thing to dry there butt. You never want to remember that the towel you just used was/could have been a butt-towel.
Kid:(just gets out of shower)
Kid:(Begins drying off with towel)
Kid:"Wait..."
Kid:(Smells towel)
Kid:"AHH! IT MY SISTERS BUTT-TOWEL SHE USED THIS MORNING!!!)
(ominous laughter heard)
by RoboChick May 09, 2009
 
2.
A towel used by someone in their ass crack. It can be somewhat clean and hygienic as in butt-towel, when used after a shower.

However, many males use a butt towel to clean the grit off their anus and ball sack, when they are too lazy to bathe more than once a week.
My girlfriend used a butt-towel right after her shower to dry off her cooch and butt crack. I would have used it on my face after that and not been offended at all by her sweet smell, but she immediately took it to the wash room and threw it in the washer.

Mark is such a mongoloid. He's almost 40 and still lives in his mom's basement. I don't think he bathes often, which is one reason why he shaved his head and obtained a butt towel to wipe the scum and sweat off his sphincter and nut sack. What a fucking groder.
by Ass2mouth4life June 13, 2009