Preparing to hear something emotionally bad, or preparing for an impact (for an example: car going to crash)
*car about to crash*
Driver: Brace yourselves boys!

or

Girl 1: Brace yourself, because you're not going to like what I'm about to say.
by urbandictionarer March 29, 2017
Prepare yourself mentally or emotionally for hearing something unpleasant, out of place or inappropriate.
"...they dropped the ball and now, brace yourself -- they're making us pay for it."
by Carlos Luis March 20, 2007
In the small Norfolk town of Kings Lynn and the villages surrounding, 'bracing yourself' is a term followed by a face similar to a gurn. The facial expression is called 'a brace'or 'the brace' with an 'urghh' sound attached
Rob:Brace yourself Jamzo!
Jamzo:*Braces* URGHHHHHH!
by Jamzo October 11, 2007
Phrase used when something unbelievable wonderful is about to happen to someone else or even to yourself and without this warning the person's heart might stop -- at least for a moment!"
"Brace yourself, you're about to get the ride of your life!"
by Lucas Watzenrode September 6, 2018