hang on to your hat

1. Watch out; be prepared. — Used as a command, usually to warn of an unexpected action.
"Hold on to your hat," said Jim as he stepped on the gas and the car shot forward.
2. Get ready for a surprise. — Used as a command, usually to warn of unexpected news.
"Hold on to your hat," said Mary. "Jim asked me to marry him."
Categories: informal verb

'hang on to your hat' on video