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.
by maggotvommit April 17, 2004
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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!

by RD Machine January 10, 2007
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The sweat that drips from your balls onto your sister-in-law's chin.
by Anonymous March 15, 2003
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Irritation to the undercarriage of the female breast due to the combined effects of environmental heat, tight under garments and dim titties being plump AF.

Common Side Effects: Tender red patches in the folds of the breast, tit zits, chest wetness, a general sense of irritability.

Not so rare, serious side effects: Placing any absorbent material in the cleavage crook, going braless in the office, asking for a divorce.

When to call a Doctor: Serious consideration of a breast reduction.
Either Rebecca missed her mouth at the water fountain again or she’s got a severe case of humid-a-tittie.
by AmeDame July 10, 2021
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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".
by Mysteron August 4, 2003
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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 4, 2010
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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 23, 2008
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