Green’s Dictionary of Slang

(W.I. Rasta) gossip, the sound of whispering.

1950		Bennett, Clarke & Wilson Anancy Stories and Dialect Verse 101: susu – whisper.
1960–82		L. Bennett Auntie Roachy Sey (2003) 83: Dat hear-sah seh-seh, susu, kas-kas an all dem tings.
1975		T. Rhone School’s Out I i: The occasional intrigue, the little undercurrents, that sort of thing, plus there is a fair amount of backbiting, su-su.
1991		L.E. Adams Jam. Patois 47: Shet uno moht, a so-so su-su uno ya! – Shut up, it’s only gossip you hear!
2005		(con. c.1945) A. Wheatle Island Songs (2006) 16: He also didn’t want the preacher man [...] to offer his fellow villagers any gossip or ‘su-su’ talk of how the Rodney family did not give of their best.