When you are taking a shit in an outhouse while a chick is giving you head. See blumpkin
"Dude, I drove through West Virginia one time and hooked up with this hot mountain chick and she gave me a country blumpkin behind her parent's shack. It was messy but awesome!"
A variation of the blumpkin, in which the reverse cowgirl is substituted for the normal accompaniment of fellatio to a good old country shit.
"Last night little Johnny damned-near walked in on a blumpkin, but Donna had the wherewithall to shift her ass into the reverse cowgirl, so we told the little guy we both had to shit at the same time. The country blumpkin saved our family !"