machine gun shits
When you are taking a shit and it is alternating quickly from runny shit-farts-solid shit making a sound similar to a machine gun shooting into water.
"The chili I ate last evening gave me the worst machine gun shits this morning."
machine gun shits
When you start shitting out turd after turd and it sounds like a machine gun.
Dude, kyle said he had the machine gun shits after he had mexican food last night.