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A towel is a piece of crap you use to wipe your sweaty, smelly ass off. If you wipe someone else, you're a towel and they're a stupid friend.
My cousin wiped my face after I ate pizza and cried. He's a towel and I'm a stupid friend.
I wiped my teacher's head during lunch. She called me a towel and said I was the worst student ever.
My brother wiped my mom's forehead after she yelled at me. He's a towel and she's a drama queen.