朝蠅暮蚊
chou.you.bo.bun

Literally: morning – fly (the insect, not the verb) – evening – mosquito

Alternately: A troublesome situation or gloomy atmosphere caused by an assemblage of narrow-minded, trivial people. Like being surrounded by clouds of flies in the morning and clouds of mosquitoes in the evening.

Notes: This delightfully insulting image comes to us from the collected poems of Han Yu (韓愈, in Japanese Kan Yu), whom we’ve seen before.

The “fly” character can be written as 蠅 (old form) or 蝿 (new) without any especial difference.

Found in the title of episode 34 of an obscure anime about… delinquent teenage girls with psychic powers?