The situation that a guy finds himself in during anal sex where the girl farts with such force that it forces his dick out of her hole. In extreme cases this will result in the need for an immediate shower.
Stan: Well, I finally got Wilma to let me fuck her up the ass.
Mitch: How was it?
Stan: It was great until we had an untimely blowout, and boy was it messy.
Mitch: How was it?
Stan: It was great until we had an untimely blowout, and boy was it messy.
by patsguy November 22, 2011
Get the Untimely Blowoutmug.