Relative Humidity

The sweat that forms on your balls when you're fucking your sister. May also be applied when fucking your hot female cousin, i.e. incest.

The relative humidity went up as soon as mom & dad left for the evening and I slid into my sister.

by Bushpig61 September 5, 2010

Relative Humidity

The beads of sweat you get on your balls when you're fucking your aunt.

Man, it was hot out last night! My pants were soaked from the relative humidity when Ida and I came in from the porch.

by John Vanderlay March 22, 2008

Relative Humidity

The sweat that forms on your balls while thinking about screwing your wifes sister.

Man, I was looking at those family pictures of Helen at Disneyland, I had some serious relative humidity going on in my pants!

by PSA Pilot February 18, 2010

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

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

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.

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!

by Nicole December 13, 2003