What the nani - can also be pronounced like this : what da nani, what nani...

A mix of "What the fuck" and the japanese word "Nani" from Ken the Survivor (stands for "What ?!").

Use it when you are very suprised and would be tempted to say "What the fuck ?!", but you really like Japan (and slang is sometimes frown upon).
1) Your father : "You listen to Rammstein ? I hate Rammstein ! It's pure shit !"

You : "What da nani ???"

2) Your girlfriend (if you're a male) : "Hey, in fact I'm a lesbian... Ciao !"

You : "Wh-what the nani ??"
by WhatNaniDePunjitsu April 26, 2020
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