spitting bars 

To freestyle rap

this guy be spitting bars before he could walk

spitting bars by goegrnia June 23, 2015

Spittin Bars 

A musical term associated with rap music. Rappers would usually recite a 16 bar verse before the hook of a song. The term has now been redefined to describe the manner in which certain individuals engage in conversation.

'I saw this one chick bruv and she was serious....yeh man i was there for time just spittin bars'

Spittin Bars by Donis July 14, 2006

National spittin bars day 

On January 28 is National spit bars day where you get to freestyle any kind of bar or any kind of beat you want

Friend: you did you know its national spittin bars day?
You: No?
Friend: well freestyle rap anything you want and there you go

National spittin bars day by Mr.LOOKOUT January 11, 2022