Green’s Dictionary of Slang

(S.Afr. black) brandy.

1962		T. Hopkinson In the Fiery Continent 85: Kid Jailhouse Blues comes with twelve glasses and a teaspoon which he uses as a measure to pour droplets of mahog into the glasses.
1974		Casey ‘Kid’ Motsisi ‘Kid Fall’ Casey and Co. (1978) 52: He has a few slugs of mahog.
1980		B. Setuke ‘Dumani’ in Mutloatse Forced Landing 58: The amateur gangsters who pay their way to and from the ghetto by bribing the barrier-attendants with a nip or ‘ha-ja’ of mahog as they pick the pockets of innocent passengers.