しらかわよふね

Pretending to know something you don't Bullshitting

From a story where a tourist lies about going to Kyoto for sightseeing. Someone asks 'How was 白河?' (a region in Kyoto). The tourist hears this as 白川 and thinks it's the name of a river, so the tourist says, 'I don't know, I slept all night夜 on the boat船.' and this exposes their lie.

知ったかぶりをいう。また、何も知らないほど、ぐっすり寝こんでしまうこと。