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1.
Refers to the vintage 1970-1980 Cadillac series. The rear windows had a diamond shape.
(I wanna...) Diamond in the back, sunroof top, diggin the scene with a gangsta lean
by James. June 24, 2004
 
2.
a characteristic of early model cadillacs used primarily by the urban community that was popularized in a classic song, "Be Thankful for What You Got" by one-hit wonder William Devaughn and has been covered and sampled many times over, most notebly in rap songs beginning in the early 90s.
Though you may not drive a great big Cadillac
Gangsta whitewalls
TV antennas in the back
You may not have a car at all
But remember brothers and sisters
You can still stand tall

Just be thankful for what you've got
Though you may not drive a great big Cadillac
Diamond in the back, sunroof top
Diggin' the scene
With a gangsta lean
Gangsta whitewalls
TV antennas in the back
by uncle sam November 05, 2004
 
3.
junvenile halls and probation facilities require you follow the red/yellow line.

with your hands on your back fingers stretched out thumb joint, and fingers over the other to create a "diamond in the back" called by probation officers.
put those diamond in the back when you walk out the day room son
by MachRc February 09, 2009
 
4.
Phrase used to describe something that is tight,off the chain, phat, pimped out, badass, or anything you want it to mean.
1. Yo, this video game is a diamond in the back.
2. "Hey, remember that time your mama caught us looking at penis enlargers on the internet?" "Yeah, that was a diamond in the back dawg."
by C tizzle October 09, 2007
 
5.
Antenna on the back of a car used to pick up television signals.
I wanna diamond in the back, sun roof top, diggin in the scene with a gansta lean.
by Kenneth March 16, 2005