Definition of shit-eating in US English:

shit-eating

adjective

US
vulgar slang
  • Smug; self-satisfied.

    self-satisfied, complacent, self-congratulatory, superior, puffed up, pleased with oneself, self-approving, well pleased, proud of oneself
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Pronunciation

shit-eating

/ˈʃɪdidɪŋ//ˈSHidēdiNG/