Green’s Dictionary of Slang

1. delirium tremens.

1959		A. Delius Last Division 75: My brother, from drinking, once had the horries.
1977		D. Muller Whitey 11: A grassy, treey, flowery place that was not at all like the usual gloomy places where the horries get at you when the booze has destroyed all the vitamins in your system, ... and the things come. [Ibid.] 61: They would give me a wallop of paraldehyde to knock me out and chase away the horries. [Ibid.] 191: You’ve got vlam horries, Whitey.
1989		Sun. Times (Jo‘burg) 17 Sept. Mag. 6: The ‘horries’ for those of you who still stubbornly deny yourself the idiomatic juiciness of Afrikaans, is a colloquial term for that state which English describes as ‘The DTs’ or delirium tremens [DSAE].

2. a phobia, a visceral fear.

1971		Cape Times 3 July Mag. 4: I watch the activity for a while, and then I get the horries that the rodents might eat me.
1989		Sun. Times (Jo‘burg) 24 Sept. Mag. 8: Last week I started dispensing my own personal ‘Horries’ awards, an inversion of the advertising industry‘s Loeries which are meant to praise and reward excellence. The Horries do exactly the opposite [DSAE].