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humidity 

the amount of water vapor in the air, expressed as a percentage of the maximum amount that the air could hold at the given temperature; the ratio of the actual water vapor pressure to the saturation vapor pressure. Abbreviation: RH, rh
It's not the heat, it's the humidity that tires me out.
humidity by lionel123 January 4, 2007

relative humidity 

The bead of sweat that rolls down your Sister's back when you're banging her doggie style.
The Relative Humidity was high during our Family Union
relative humidity by Anonymous September 18, 2003

relative humidity 

the sweat on your balls while fucking your cousin
At the family reunion, the relative humidity was all i could think about
relative humidity by CASEY CARMAN January 23, 2009

relative humidity 

It's that little drop of sweat that beads up on the back of your neck and dribbles down your back, thru your crack and eventually drips off of your ball while your fucking you sister.
relative humidity by Pat May 14, 2003

relative humidity 

The sweat that drips off your balls when you're caught fucking your cousin!
Last night I had some major relative humidity!
relative humidity by Nicole December 13, 2003

relative humidity 

The perspiration that forms between the shoulder blades of your first cousin, while you are fucking her in the ass.
Uncle Mike ... the relative humidity sure is high in your daughters bedroom.