1 definition by bijomaru78

Comes from the sound of a Happy Birthday, shortened to Happy B-day. Since "b-day" is pronounced in the same way as "bidet", Happy Bidet is a humorous way of wishing someone a happy birthday.
- Isn't it your birthday today?
- Yes it is.
- Oh, Happy Bidet, mate!
by bijomaru78 June 2, 2018
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