Green’s Dictionary of Slang

samfie n.

1. (W.I.) a confidence trick.

1943		cited in Cassidy & LePage Dict. Jam. Eng. (1980).
1980		M. Thelwell Harder They Come 202: The giant samfie, the great hustle, which they knew came at least once in his life to every man.
1985		‘Jennifer Blowdryer’ Modern English 83: samfie (n): When somebody is jive-talking, giving a con rap to you — they’re talking Pure Samfie.

In derivatives

samfieism (n.)

deceit, trickery.

1979

cited in Allsopp Dict. Carib. Eng. Usage (1996).

In compounds

samfie-man (n.) (also samfai man)

(W.I.) a confidence trickster.

1959		M.F. Katzin Higglers of Jamaica (t/s) 6: [note] A more common term for a confidence man is ‘samfie man’.
1966		(con. 1940s) L. Bennett Jamaica Labrish 17: Whether they be matriarchs, [...] higgler, samfie man, political demagogue, or quashie.
1970		N. Dawes Last Enchantment 37: Is just a samfie-man, Mama. Plenty of them come down from the States these days.
1987		Festival Literary Anthology (Jam. Cultural Development Commission) 82: McIntyre snorted contemptuously. ‘If dem get in den yuh jus’ ’ave a new set of samfie-man. Yuh see any change in dis country since 1944?’.
1991		L.E. Adams Jam. Patois 61: Samfai man: trickster, conman.
1997		E. Brodber Louisiana 166: There I found that I was what they call a ‘samfie man’ who had led their daughter into ‘lower class life’.