Green’s Dictionary of Slang

1. a fool, a gullible person.

1943		cited in Cassidy & LePage Dict. Jam. Eng. (1980) 362/2: Prekeh, unworthy person, fool [...] Precky , a name for one who is easily defeated.
1955		cited in Cassidy & LePage Dict. Jam. Eng. (1980) 362/2: Man /preke/ tell him anything and he’ll believe it .

2. a low-class prostitute.

1956

cited in Cassidy & LePage Dict. Jam. Eng. (1980) 362/2: The lowest class of prostitute (to call anyone /preke/ is a /bad kos/).

3. a good-for-nothing, an ill-kempt, dirty, slovenly man.

1958

cited in Cassidy & LePage Dict. Jam. Eng. (1980) /preke/ a man of sloppy appearance, one who doesn’t shave, wash, and dress carefully.

4. something considered scandalous.

1995

Francis-Jackson Official Dancehall Dict. 41: Prekkeh [...] 2. a scandalous happening: – what a prekkeh!