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1.
A term that refers to something of great awesomeness.

"Oh my god, did you see 300?"

"Duh, man, it was WINSAUCE!"
by ShoopDaWhoop March 15, 2007
 
2.
When something is so win, they made it into a sauce.
Steven seagal's pony tail is so Win Sauce
by Betty Pierce March 28, 2011