Green’s Dictionary of Slang

(S.Afr.) an excl. of dismissal or disbelief, ‘my foot!’.

1971		Beeton & Dorner in Eng. Usage in Southern Afr. II:149: Good rugby player se voet! he didn’t score a single goal [DSAE].
1980		A. Dangor ‘Waiting for Leila’ in Mutloatse Forced Landing 165: ‘Oh shut up. I told you I’m not moving, this is my home!’ ‘Home se voet! Look at it.’.
1992		Weekly Mail (S.Afr.) 15 May 25: The authorities argue that the secret police network which we have shown to be connected to violence was a legitimate undercover operation directed at arms smuggling. Se voet, we say [DSAE].