What's the matter?

[Charlie Bernstein]

In the US, it's a common idiom. (It's grammatical, and it's not slang.)

Commander Cody
Fred McDowell
Bessie Smith
Dorothy Norwood

[angela erin]

that is idiom,,,it is commonly used everywhere.

[Rover_KE]

Welcome to the forum, Angela.

That is an idiom. It is commonly used everywhere.

Please note my amendments to your capitalisation and punctuation.

ESL students expect native English-speakers to write in perfect English.

I suggest you add 'as far as I know' at the end, unless you know for a fact that it's commonly used in every English-speaking community in the world.