The abbreviation of Yves Saint Laurent, one of the ultimate French couture designers. In 1985, Caroline Rennolds Milbank wrote, "The most consistently celebrated and influential designer of the past twenty-five years, Yves Saint Laurent can be credited with both spurring the couture's rise from its sixties ashes and with finally rendering ready-to-wear reputable".
YSL, Dior, et Chanel are the pinnacles of French fashion.
Acronym for: You Should Leave
Mainly used in texting or IM situations.
Nicer way of saying GTFO.
person 1: yeah dude i'll just borrow it.
person 2: woah... ysl