/jp/ - Otaku Culture

Speaking of 冗談. There's an expression that goes 冗談はよし子さん which means "stop joking".
This threw me off when I watched love live. For context the name of the girl in the back with the blue hair is よしこ. One of them had an idea to ride a very slow train while pressed for time. That idea wasn't even from よしこ, so when the brunette said that line I thought why is she a joke? She has nothing to do with it. Watching it subbed was even more confusing.