Hang on to your hat!

hang on to your hat

Get ready for what's coming or about to happen! Hang on to your hats, everybody—we're about to see what these fireworks can do!
See also: hang, hat, on

Hang on to your hat!

 and Hold on to your hat!
Fig. Get ready for what's coming!; Here comes a big shock! There is a rough road ahead. Hang on to your hat! Here we go! Hold on to your hat!
See also: hang, on