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1.
When one has diarrhea that is so painful he screams as if possessed by demons
Guy #1: "Hey man, where is John?"

Guy #2: "Oh, he is in the bathroom. He has had the screamin' demons all night."
by swords55555 December 02, 2009
 
2.
A type of drug that is a mixture of crack,heroin,embalming fluid and LSD with sometimes traces of other drugs that is smoked.

Said to have gotten it's name because that is what it makes you see and/or act like.
He smokes screamin' demons.
by The Fury 13 December 07, 2010