The act of shoving a large amount of poop back into one's ass. May be used as torture, pleasure, or a method of passing time. May also be done alone, with a partner, or in large groups of self breech loading or mutual breech loading. May also use oneselves poop, the partners poop, or a combination of both people's poop.
"Bob" was bored one day. "Bob" took a massive dump. "Bob" caught his own poop in his hand and had breech loaded it back into his ass by the act of breech loading.