A term used to describe something amazing or awesome; used as a substitute for the surfer dude slang sick, or the hood slang ill.
Substitue for ill-
Gangsta: Yo, dat shit is diseased!
Substitute for sick-
Surfer Dude: Hey man, that was wicked diseased!
Gangsta: Yo, dat shit is diseased!
Substitute for sick-
Surfer Dude: Hey man, that was wicked diseased!
by Alien From a Distant Planet November 21, 2007