A variation of the cunnilumpkin where a woman receives cunnilingus while the cunnilinguist is defecating. This can be intentional or accidental.
Also see blumpkin, reverse blumpkin, and the inherently messy double dumpkin.
For the rarest variation of all time, see cunnilumpkin decker.
Intentional: For those rare women who find the smell of their lover's feces erotic, the reverse cunnilumpkin is the most exciting way to receive oral sex.
Accidental: My girlfriend loves it when I go down on her and chow box, and sometimes she can be so pushy about it. The other day I needed to crap so bad, but she told me to shut up and suck her vulva. Just as she was about to climax, I lost control of my bowels and dropped the whole load in my pants. It was a perfectly timed reverse cunnilumpkin, although I could have done without all the shit in my favorite khakis.