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.

relative humidity by maggotvommit April 17, 2004

relative humidity 

the saliva left on your genitals after your cousin gives you oral sex

Man last night my cousin trina came over to my house. I just thought we were gonna hang, then a few to many beers. Damn the ho was down on me! ie. relative humidity!

relative humidity by RD Machine January 11, 2007

relative humidity 

The sweat that drips from your balls onto your sister-in-law's chin.

relative humidity by Anonymous March 14, 2003

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 by John Vanderlay March 22, 2008

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