'boing boing' or 'boing-boing'?

[Forever Light]

Hi everybody,

Which of these versions is grammatically correct?

I hear a 'boing boing'. or I hear a boing-boing.

Thank you!

[Josef Essberger]

Hi everybody,

Which of these versions is grammatically correct?

I hear a 'boing boing'. or I hear a boing-boing.

Thank you!

The first.

It’s not really a matter of grammar but just which works better and in my opinion the first works better in what I suspect is your context though since you have not chosen to reveal your context I am having to guess. If you want definitive answers always better to give full context.

[Murazik]

Hi everybody,

Which of these versions is grammatically correct?

I hear a 'boing boing'. or I hear a boing-boing.

Thank you!

In my opinion the second one is better and correctly