when someone ties a sweatshirt around their waist to cover their butt.
When Alyssa and I go walking, she always wears a butt curtain.
by lauryn May 30, 2005
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a floppy, saggy, generally nasty butt
"What you talkin' about...Curtain Butt? I'd hit that!"
by SPDRMN October 5, 2006
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