I think bling-bling came first, and was then truncated. I say this from more than just guesswork, as I at one time had access to OneLook's "undefined words" database -- in response to which I added bling-bling to my own online dictionary. as indicated, the origin is gangsta rap (or hip-hop slang).

bling-bling

edit: here's the wikitake

Last edited by tsuwm; 12/18/2006 5:47 PM.