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hipster way of saying "Happy birthday." Mainly used on facebook walls on the east coast of Canada. Origin of "Bidet" unknown, potentially a love child of the infamous "Auto correct" but this idea is largely disputed.
"Happy Bidet Mang! Wanna come over for a sixer of bronsons to celebrate?"

-"Bidet? Auto-correct fail?"

"Naw man... Bidet, birthday is too mainstream."

-"You're such a tosser Jerry, let's go Midtown instead and bust a moby."
by The Gilf October 27, 2013
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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 12, 2018
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