Green’s Dictionary of Slang

iceberg slim n.

[SE iceberg, an unemotional person; more immediately the street name of Robert Iceberg Slim Beck (1918–92), one-time pimp and author of a series of autobiographical books; such gangsta rappers as Ice T (real name Tracy Marrow) took their names from his]

(US black) a pimp.

[US](con. 1940s) Deuce Ofay Productions ‘The Jive Bible’ at JiveOn.com 🌐 Iceburg [sic] Slim n. Any man pandering women.