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When you have your lips sealed around someone's booty hole and they blow a fart hard enough to puff out your cheeks.
"I was eating my girls booty the other day and she gave me the harlem bagpipe"
The result of smoking rocks and incurring 1st, 2nd, and/or 3rd degree burns on your lips; as if they've been placed on a hot muffler.
Crackhead Sally got muffler lips.