Green’s Dictionary of Slang

1. a creole white or Caribbean person who has, to all appearances, no black ancestry (although there will be a distant relation).

1888		E.E. Dickinson Winter Picnic 243: ‘That’s a Conchy Joe. They all bad.’ ‘What is a Conchy Joe, Lemuel ?’ ‘The people from the Out Islands, mum.’.
1957		P.F. Anson Hermit of Cat Island 245: The altar built by the boys of the Nassau prison had another large crucifix [...] which stressed that Our Lord himself was ‘no conchy Joe’.
1981		C.A. Hughes Race and Politics in the Bahamas 108: Black Bahamians are not free so long as Bay Street is totally controlled by Conchy Joe.
1996		Allsopp Dict. Carib. Eng. Usage.
2001		C.P. Baker Bahamas, Turks & Caicos 47/1: Conchy Joes are readily identifiable by their [...] blue or green eyes, freckled skin, and blondish hair.

2. a poor white.

1966		D.J. Crowley I Could Talk Old-Story Good 24: A certain Scottish and Irish flavor remains also in the speech of the local ‘Conchy Joe’ whites.
1996		Allsopp Dict. Carib. Eng. Usage.

3. a mixed-race Bahamian, who sees themselves as socially superior to blacks.

1975		F. Exley Pages from a Cold Island 77: In the parlance of south Florida and the Bahamas a Conch or Conchy Joe is an interbred person, mostly white, who for reasons known only to himself hates blacks with a near-deranged passion.
1996		Allsopp Dict. Carib. Eng. Usage.
1997		B. Antoni Paradise Overdose 52: I means you, white, Conchy Joe. Quit pushing drugs up you nose-thrill. Push you nose in Bible.