hold on to your hat!

hold on to your hat

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

hold (or hang) on to your hat!

said as a humorous warning that conditions are about to become more difficult or hazardous.
2000 Brandweek Hold on to your hat (and wallet) as the stock market zigs and zags!
See also: hold, on