music characterized by long, seemingly never-ending episodes of jarring, dissonant, screechy "music", with a particularly heavy use of horn instruments.

jazz that is "assy", using "ass" as an adjective
"Dont Fear The Reaper" can always use more cowbell, but one never needs more horn in ass jazz.

Guy: "That noise is setting my teeth on edge. What is it?"
Girl: "Oh, that's just the ass jazz show on college radio.

Aslo, a common phrase associated with ass jazz is, "make it stop!"
by Ed Melvinado March 18, 2010
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