Tekashi69 ain't backin' down after Adrien Broner said he'd "pull up" on the rapper ... daring the boxing star to come see him when he touches down in Brooklyn.
Broner says 6ix9ine started the beef by calling him a "clown" over Instagram -- which set A.B. off.
"Ey 6ix9ine, don’t be commenting no f*ck sh*t under my pictures, boy. Talkin’ bout clown, n**ga ... I’m about to pull up on you, n**ga," Broner said.
"I ain’t one of these rap n**gas you be trollin’ with n**ga, quit playin’ with me, n**ga.