Break-one-s-arm-patting-oneself-on-the-back meaning

(humorous, derogatory) To be very full of oneself. Often used as a sarcastic caution - "don't break your arm patting yourself on the back"

We're the best football team in the state! - Careful, dude, don't break your arm patting yourself on the back.

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Origin of break-one-s-arm-patting-oneself-on-the-back

  • From pat on the back, and the uncomfortable position one would have to assume while patting their own self on the back.
    From Wiktionary