A very short skirt a female wears when she wants to have a male put his weiner in her butt.
Jon- "Sammie wore a butt skirt yesterday, to let me know she wanted to have buttsex."
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A skirt so tight and so short when you bend over you can see her butt hole.
For example a girl with a mini skirt bends over, it is instantly called a butt hole skirt.
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