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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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 09, 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 04, 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 03, 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 22, 2008
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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.
by dintx March 05, 2011
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