Backseat Nigga 

A backseat nigga is dumb ass nigga that rides in the backseat because you can’t fuckin stand him in the front seat.

Yo get in the back bruh
Why
Cuz u is a backseat nigga

Backseat Nigga by Papichulo.no April 9, 2019

Backseat Nigga 

A member in the crew who isn't really part of the crew. A backseat nigga drifts in and out

"Aye man, where's trey?"
"He's out with another crew"
"Oh, he's the backseat nigga, huh?"

Backseat Nigga by Versace Man June 5, 2014

Backseat nigga 

One not worthy of sitting in the front seat.

"Get to the back, you a backseat nigga."

Backseat nigga by Kosherbvsedqueen September 24, 2016