break one's arm patting oneself on the back

动词 v.

英文释义

动词 v.
  1. To be very full of oneself. Often used as a sarcastic caution: "don't break your arm patting yourself on the back". derogatory,humorous
    — — We're the best football team in the state! — Careful, dude, don't break your arm patting yourself on the back.

词源

From pat on the back, and the uncomfortable position one would have to assume while patting their own back.
18 次浏览 数据来源: Wiktionary