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.
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!
The sweat that drips from your balls onto your sister-in-law's chin.
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".
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.
The sweat between two cousin's having sex together.
The relative humidity had to be %90 between aunt Mary jo and cousin Clem
The sweat that rolls off of your back while banging your sister-in-law.
The relative humidity was 100% while I tapped dat ass.