main rider

Main rider is your main nigga I'm your life. You stay 100 to one another and don't got any side bitches.

"My boyfriend is my main rider"

main rider by Uonevenknow May 15, 2014

Mainriver 

Somebody who is so mainstream they need defining by a new word.
Calling them mainstream is out of order to mainstream kids.

Oh dear, he likes the Kooks and wears pumps. He is so mainriver.

Mainriver by Joe12112 March 3, 2009