Vernacular play is endless, this ain't the shit for beginners
This was probably a line that was supposed to suggest Jones is extremely lyrical. However, vernacular means:
The native language or native dialect of a specific population, as opposed to a language of wider communication that is a second language or foreign language to the population, such as a national language, standard language, or lingua franca.
Which I suppose could just be taken as ‘word play,’ but in a literal sense, would make no sense.
To help improve the meaning of these lyrics, visit "Fisticuff (Prod. Nonsense Beats)" by Alex Ruffin (Ft. Deondre Jones) Lyrics and leave a comment on the lyrics box