Green’s Dictionary of Slang

the labia majora; also as sing.

1990		S. Morgan Homeboy 3: Dozens of cheap rings dangled from her ears, nostrils, nipples and [...] good ole major labes.
2001		J. Stahl Plainclothes Naked (2002) 225: He dragged a magazine called Labe Happy from under the couch [...] The glurping vulva made him think of open-heart surgery.