Green’s Dictionary of Slang

verandah n.

1. the gallery of the Old Vic Theatre, London.

[UK]J. Ware Passing Eng. of the Victorian Era.

2. (Aus./US) a pot belly.

[US]T.A. Dorgan in Zwilling TAD Lex. (1993) 134: The old boys with the big fronts who take boxing lessons to reduce the veranda.
[UK]K. Lette Llama Parlour 12: Aussie blokes, those without Brewer’s Droop and verandas over their toyshops may be bronzed and blond [...] but they are also emotional bonsai.

SE in slang uses

In phrases

on the verandah (adj.) [i.e. not in the house proper]

(N.Z.) marginal, peripheral.

Landfall 150 134: But she wasn’t on the verandah on this journey [DNZE].