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1.
To have little intelligence and/or to smell like dung.
"So what if I'm stupid at least I'm not poopid!"
by JoeSemple September 28, 2005
 
2.
The cupid of poop. When he hits you with his arrow, you suddenly get the urge to poop. He is the explanation for those surprise, emergency poops that tend to creep up on you at the most inconvenient of moments.
"Hey, man, what's wrong with you?"
"I think I just got hit by Poopid's arrow! I gotta take a shit—now!"
by Zach's wife May 19, 2013
 
3.
To be poopy and stupid
Baby: I PEED MY PANTS!!
Neglective Parent: GOOD U FUCKING POOPID RETARD!!
by ze jimjim September 04, 2005