A scooper-dooper is a pail, much like a pail kids use in the sandbox, that is picks up fecal matter stuck
on the floor and/or wall.
If someone poops and misses the toilet, or just wants to be a douche and poops
on the wall, then you use a scooper-duper to scrape it off the floor or wall if stuck, or if not stuck then just pick it up.
The scooper-duper is a filthy pail that much resembles a dust pan, and has
probably not been used in over a year (depending on how much poop lands on your floor or walls), it is slicked over dusty and filthy, and is probably stored in a cubby hole, or closet that has been previously infested with mold, or rats.
Did you hear what Jon had to do at work at Wal-Mart yesterday? Someone pooped
on the floor next to the moldy out of order toilet no one used, and
the manager told him he had to use that nasty scooper-duper to
clean it up...
