Screendoor shit 

Watery and would not be stopped by the wire.

I took a screendoor shit this morning.

Screendoor shit by Bridog57 May 12, 2016

Screen door shit 

Diarrhea so runny and projecting at a high velocity that it’ll fly right through a screen door.

“I ate at the Mexican place and got the screen door shits so bad before I even left the parking lot.” Jayson

Screen door shit by BUTT0N February 8, 2021

shit through a screen door 

An extremely runny, liquidy shit that would pass completely through the screen of a door, if the opportunity arose.

"Drinking too much of that fancy beer makes me shit through a screen door."

shit through a screen door by Kristi go January 13, 2007