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".

Acronym for: You Should Leave

Mainly used in texting or IM situations.

Nicer way of saying GTFO.