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1.
YSL
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.

by Richer_Than_You January 28, 2009
 
2.
YSL
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
by Young Tweak ♠ October 20, 2011
 
3.
ysl's= Yves Saint Laurent clothing brand and all that other stuff...shoes <3.
In my cousin's song from the album "Brave" she sang a song called "Mile in These Shoes" and she says "...i cant walk a mile in my YSL's..."
by betchhh. November 13, 2007