Top Definition
YSY
You single yet. When you know a really good looking girl who has a boyfriend and your in line for some fun.
Man: "Hey sexy, YSY?"
Female: "Nah, not yet"

Man: "Damn, can't wait to tap that"
by GMLK May 14, 2013
YSY
Expression of delight or joy, often at unexpectedly good turn of events.

Written form often capitalised. Origin believed to be corruption/mistype of Yay. YSY is to "Yay" what teh is to "the".
YSY I won $500 playing on-line poker last night.
by Tenrex January 10, 2009

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