anything that is crazy in any way at all, but especially in a good way. or just amazing in general.
the object or action being described by this phrase does NOT need to apply to music to be used correctly, and certainly not to that specific genre of music.
-oh man, did you go to the concert last night?
-no, how was it?
-it was awesome, their lead guitarist is really crazy latin swingjazz
-hey i made some brownies, want some?
-yeah man! that's crazy latin swingjazz!
-how are they?
-mmm. great, crazy latin swingjazz.