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relative humidity 

The sweat that drips off your balls when you bang your sister-in-law.
"The relative humidity was way high at my cousin's wedding".
relative humidity by Mysteron August 4, 2003

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.
Relative Humidity 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.

relative humidity 

A feeling of uncomfortable warm dampness while visiting in-laws or extended family.
Bob: How was the reunion?
Sam: Fine, except for all of the relative humidity.
relative humidity by dintx March 19, 2011

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!
Relative Humidity by PSA Pilot February 18, 2010

Humidity 

The devil's ball sweat
It's as hot as hell and as humid as the satan's balls. This humidity is dripping right off the devil's balls.
Humidity by strgzr2893 April 10, 2019