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1.
n. (lip lI'-ner) - for women, a frontal wedgie caused by the natural rise and snuggling of a string thong between the vulvae

(as opposed to a camel toe caused by outer wear ride ups)

v. - to give a female a lip liner
Ex 1: When Jess got a call, momentarily distracting her, Eric ran up and gave her a lip liner.

Ex 2: Spinning gives me lip liners... bad!
by Webster April 05, 2005