Scammers specifically hunt for wealthy easy marks.
Tips
usage
Almost always figurative in modern Chinese. The literal sense ('fat sheep') survives mostly in restaurant names like 小肥羊 (the famous hot pot chain), where it's a positive descriptor of mutton.
register
Colloquial. The figurative sense - 'sucker / mark' - has a slightly cynical, predatory edge: the speaker is implying someone is about to be fleeced.
