Green’s Dictionary of Slang

mal adj.

(S.Afr.) crazy, weird.

[SA]L. Beake Strollers 21: You must be mal, man. Going with Katjie se mob!
[SA]A. Lovejoy Acid Alex 210: The Lord of the Rings is an amazing story about hobbits and ents [...] and all sorts of other mal goeters. [Ibid.] 216: I went mal spiking with my scab Shane.