Little Lord Fart Leroy

When you feel great intestinal pressure, but it turns out the cause of it was a small turd blocking your sphincter, leading to gas building up in your insides, that small turd is named a "Little Lord Fart Leroy" after its diminutive size yet king-sized abilities.

I thought that I really had to go to the bathroom, but it turned out to be a Little Lord Fart Leroy.