noun
whoopee cushion; fart cushion
A novelty cushion that makes a fart-like noise when sat on. The name is onomatopoeic from the sound.
友達の椅子にブーブークッションを置いて、大笑いした。
I put a whoopee cushion on my friend's chair and we had a good laugh.
Variant with interpunct; less common but still seen.
Loanword from English 'whoopee cushion', with the Japanese name mimicking the sound it makes.