Green’s Dictionary of Slang

(US black) a singer of reggae rap music.

1986		R. Hewitt White Talk Black Talk 115: The albino toaster Yellow Man.
1995		G. Small Ruthless 190: This militant bass-driven musical form spawned a host of ‘toasters’ or rappers such as I-Roy, U-Roy, and Big Youth.
2001		(con. 1981) A. Wheatle East of Acre Lane 172: He saw Floyd and Sharon [...] chatting to the toaster, Yardman Irie.