Definition of "nanti"

There was no clown for the pantomime, for he had disappointed us, and of course they couldn't get on without one; so, to keep the concern going, old Johnson, who know I was a good tumbler, came up to me, and said 'he had nanti vampo, and your nabs must fake it;' which means,—We have no clown, and you must do it.

1851, Henry Mayhew, “Our Street Folk”, in London Labour and the London Poor‎, volume 3, published 1861, The Canvas Clown, page 126

She's with the trade your mother charvaed yesterday. Some omees have nanti taste!

2004, Paul Baker, Fantabulosa: A Dictionary of Polari and Gay Slang

I can't see that over his heaving thews and bulging lallies!¶ Of course he's nanti riah, but with a basket like that, who cares about his eek?

2012 January 10, Karis, “Gareth's bright blue outfit”, in Big Brother Forum (Digital Spy)‎