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hang on to your hat

Idioms  
  1. Also, hold your hat. An expression warning someone of a big surprise. For example, Hang on to your hat, we're about to go public, or Hold your hat—we just won the lottery. This expression may allude, according to lexicographer Eric Partridge, to a wild ride on a rollercoaster. [Colloquial; first half of 1900s]


Example Sentences

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From the top, hang on to your hat, and drink in the view of Deadman’s Cove, right next door!

From Seattle Times • Nov. 14, 2020