'Bird person' (鸟人) is a slangy, playfully derogatory noun used to tease or mock someone who’s acting foolishly, annoyingly, or incompetently—like a clumsy or clueless person. Though 鸟 literally means 'bird', here it functions as a vulgar-sounding prefix (similar to English 'dumb' or 'stupid' in tone), adding dismissive or mocking emphasis; 人 simply means 'person'. The term carries no literal avian connection—it’s purely idiomatic and colloquial.

This expression is informal and commonly heard among friends or peers in casual speech, especially online or in memes. It’s rarely used seriously or in formal settings, and while mildly coarse due to the phonetic association of 鸟 with a vulgar homophone, it’s generally light-hearted rather than deeply offensive—akin to calling someone a 'jerk' or 'loser' in English banter. Tone and context matter greatly: used with a grin among close friends, it’s teasing; used coldly or loudly, it can sting.