Definition of "outa"

As I stood to one side to let him go out, she asked: “Daddy, is he an uncle or an outa?”

1978, André Brink, Rumours of Rain, Vintage, published 2000, page 133

Secondly, there is an old black man, the Outa, who stumbles in from the dark to die beside their fire.

2001, South African Theatre Journal, volume 15, page 48

The reference is to a cheerful little ditty, in which an old black man, an ‘outa’, takes the long road to Mebosspruit, playing his tin guitar along the way.

2003, Antjie Krog, A Change of Tongue, page 275

[…] and lo! here’s all humanity hep and weird wandering on the evening sidewalk amazing me outa my eyeballs […]

1965, Jack Kerouac, Desolation Angels, page 101