Someone who inadvertantly shits their pants during a
time period which it is highly uncommon for
one to soil themselves.
The phrase is usually used behind the soiler's back to make
fun of them or to publicly humiliate them without thier common knowledge.
Guy #1: "Dude, that chick got so
wasted last night, she passed out and
shit her pants"
Guy #2: "No way! What a Shittypants!"
Guy #1: "She even left little shits in the matress, and she doesn't think anybody knows she
shit herself!"
Shittypants: "You guys talking about me?"
Guy #2: ........no.