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1.
Big black lips.
often darkened from excessive smoking.
That bitch Whoopi Goldberg has some huge ass leather lips.
Perfect example Gucci Mane.
by Gonorrhea Lara February 06, 2008
 
2.
chewing tobacco or dipping for days upon days until your mouth feels like a piece of leather that has been sitting in the sun Ariozna sun for two weeks in the dead of summer
"Fego has been dippping for 5 hours straight and he told he has a bad case of leather lip"
by Fego March 08, 2009