A weapon used to give someone a really nasty infection. Such as a Tooth Brush Fashioned into a prison shank then dipped into poop. The Toothbrush itself is fairly non lethal but the infection from the Poopshank will be deadly.
"Woman if you don't shut your mouth im gunna stab you with a Poopshank"
Poopichaun is a little leprechaun that visits you after a night of drinking/smoking and eating shitty food...generally after you pass out he hops up on your chin, drops trow..and defecates in your mouth. He is responsible for that God awful taste in your mouth and your stank breath after a night of buffoonery..
wow..your breath is awful...poopichaun must have visited you last night.