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A tan line you get from goin to Mexico for the summer, but get forced to wear a surgical mask due to Swine flu. You then end up with a surgical mask tan line around your mouth.
Barney: Dude, check out that hottie. She's really tan!

*girl turns around exposing a giant white square tan line around her mouth*

Barney: Holy shit... Is that a swine line?

*pukes on friends shoes*

Josh: DUDE!?
by bitchface13 August 13, 2009
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