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it is the lint that gets caught in the hair of your ass,
when pulled you rip out hair as well, making it a clump of twine.
after a long sweaty day, lint builds up in the asscrack, when picked asshair comes out with the lint making it ass twine.

2.can also be used to insult someone who is always on your ass.
by Demenous June 18, 2006
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