Examples
“Svenson heard the doors opening, the scuffle and creak of the men lifting the fallen Duke, the thwop of water slopping out of the tub, the scuffle of footsteps and finally the closing of the door.”
Lists
These user-created lists contain the word ‘slopping out’.
Tweets
Looking for tweets for slopping out.

vanishedone B.B.C. News: 'Slopping out was the practice of using buckets as toilets in prison cells.' Mar 11, 2009