【Definition】1. To think someone or something should be changed. - complaint2. To have a feud with someone or something. - disagreement【Etymology】As regards the etymology of beef, it seems to go back to the cry of hot beef! meaning 'stop thief!' (quasi-rhyming slang but more by coincidence than design, since it is far older than rhyming slang's first widespread use in the 1820s-30s); thus the 18th century cry hot beef, to raise a hue and cry. Came back to prominence through hip hop culture in the mid 90s, with many high profile feuds between major US rappers.