Green’s Dictionary of Slang

platsak adj.

[Du. plat, flat + sak, pocket]

(S.Afr.) out of funds, impoverished.

[UK]J.M. Meiring Candle in the Wind 85: We are platsak.
Fugard & Devenish Marigolds in August [film script] 30: Steal some of my jobs and then I sit platsak.
[SA] informant in DSAE (1996).