Top Definition
The high percentage of humidity that exists in the buttocks region/trousers soon after flatulance has occurred.
I have a stain in my shorts from the flatchumidity.
by Fart Smeller2 June 30, 2011

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×