Top Definition
Tight, thin lips, usually creating a pained, fake smile. Women especially celebrities might seek lip plumping injections to remedy pin lips, only to end up with hideous trout pouts.
She's got pin lips, I wouldn't know where her lips even begin if she wasn't wearing lipstick. I'm surprised she hasn't had them injected except there isn't much to work with!
by sarasplayroom.com November 25, 2009

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