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A room, or any type of contained area, in which sweat represents a substantial portion of the space, resulting in a palpable wetness in the air.
Person 1: Have you danced in the basement yet? It's so crowded.

Person 2: Yeah man, it's a sweat equity down there.
by Alejandro Da Vinci January 16, 2011
The work one invests in a business venture.
I may not have much capital, but I have a lot of sweat equity.
by Downstrike June 03, 2004
To turn a fat girl (an undervalued asset) skinny
hey remember that fat girl rachel? I made her sweat equity and she's smokin' now!
by thespot May 30, 2008