floppy, n. — Green’s Dictionary of Slang

floppy n.

[orig. Rhodesian milit. use, one who ‘flops down dead’ when hit by bullets; the targets of such bullets were invariably black]

(S.Afr.) a derog. term for a black person.

1978		E. Dibb in Fair Lady 25 Oct. 108: ‘Victor nine. Tango three. How did it go?’ ‘Positive. Small contact single floppy.’ [DSAE].
1986		V. Cooke et al. in Gray Market Plays 34: They can turn South Africa into another Zimbabwe where black people can do what they like. Murder old men [...] get drunk, smoke dagga, and they don’t go to jail because they’re floppies.
1991		informant in DSAE (1996).