allô

/a.lo/
1.
interjection

hello (used when answering or checking on a phone call)

is anyone there? (used on the phone to check the connection)

Allô ? Vous êtes toujours là ? Je vous entends très mal.

Hello? Are you still there? I can barely hear you.

Synonyms:bonjour, salut
2.
interjection

hey / hello (used figuratively to express surprise, disbelief or to call someone's attention — like 'are you serious?')

Mais allô ! T'as 20 ans et t'as pas de shampoing ?

I mean, seriously! You're 20 and you don't even have shampoo?

Synonyms:mais enfin, sérieux, non mais