allo

/a.lo/
1.
interjection

hello (used when answering the telephone)

Allo ? Oui, je vous écoute.

Hello? Yes, I'm listening.

Synonyms:bonjour, salut
2.
interjection

hello?! / what?! (used to express disbelief, surprise, or to call out someone's obliviousness; often ironic)

T'as oublié ton portefeuille ? Non mais allo, quoi !

You forgot your wallet? I mean, hello?!

Synonyms:eh oh, sérieux ?, hé ?
allo - French Definition & Examples