Definition of "finna"

Aw, dude, you finna get yo' ass whooped, mufucka.

1999, Mary Pattillo-McCoy, Black Picket Fences: Privilege and Peril Among the Black Middle Class

I don't ask for much, but enough room to spread these wings / And the world finna know my name, now listen to me

2002, “The Seed (2.0)”, in Phrenology, performed by The Roots

I ain't talkin' about what you did homie, I'm talkin' about what's finna happen.

2012, Cam Rascoe, Restless for Retribution: A Series of Short Stories, page 121