look up any word, like fleek:
 
1.
An incomplete bowel movement. Taking a half shit implies that one will have to return later to complete the shit.
"Person X: Do you ever take a shit but know you'll have to do more later?
Person Y: Dude, I don't take half shits! Only full."

"I'm really constipated today, and I could only take a half shit."
by dooddooddood September 22, 2011