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1.
Toilet water that splashes on one's chin while giving a blumpkin.
Clean off your face, baby, you've got some blumpkin backfire on your chin.
by Purrris August 14, 2006
 
2.
When you have received so many Blumpkins that you can only orgasm when you smell shit. When people fart you wind up following them around, nose to their ass, and jacking off at the same time. Instead of flushing the toilet after you pinch off a biscuit you leave it there for months, because the more rancid the odor the farther you shoot your load.
Blumpkin Backfire (adj.) "Fuck man I was with this hot slut on a date, and the fat guy next to me farted... next thing I knew I was butt naked jerkin' my turkey and spitting up mayo all over my ho's tank top!"
by Tyler Breckenridge November 11, 2005