And I have the man dem stuttering
He has that guy over there stu-stu-stuttering
D'banj is from Nigeria where they have a form of English called pidgin English. Although his lyrics in this song are not entirely in pigdin they are influenced by it. Man-dem is a term in pidgin meaning either that guy over there or those guys over there. In this case it would be THAT guy.
To help improve the meaning of these lyrics, visit "The Morning" by Raekwon (Ft. 2 Chainz, Common, CyHi Da Prince, D'Banj, Kid Cudi & Pusha T) Lyrics and leave a comment on the lyrics box