A mode of eating popularized by Eric Cartman highlighted by jamming food into the rectum and deficating out of the mouth instead of vice versa. Eric won a $20 bet with his Jew-friend Kyle for proving that introretrogestion is humanly feasible.
Popcorn is one food that would be difficult to eat using introretrogestion.
by Condor September 22, 2006
1 more definition
The act of inserting foodstuffs into the anal cavity, as means of eating.
Did you know Randy practices introretrogestion now? I saw him get a whole turkey in there!
by Gary Coleman IV June 16, 2008