The act of squeezing your butthole closed tightly in an attempt to chop your turd in half as it exits your anus. To complete a successfull chop-flush you must flush right after your initial chop so you don't clog the shitter.
Man, the biggest turd came out of my ass the other day while at work. Good thing I did a chop-flush so I didn't clog the shitter!
Post male climax in the female rectum the male male raises his arms both at 90 degree angles, and provides a forceful yet careful judo chop to the female's kidneys. This action results in the female rectum tightening up around the male penis. At this point, the male is able to pull his penis out quickly, out of the oraface nice and clean. Or as Ramon "Mr. Tapatio" puts it, "it comes out as clean as a whistle whistling noise".