Bider : v.intr. (word coming from bidet).
To bider: to have fun, to get hairy.
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Quote from the French writer Louis-Ferdinand Destouches, known as Céline (1894-1961): “Listen to me, I'm leaving tonight! It surprises me more, I join in Pau. In Pau, I'm kidding. Everyone bide the pedestal table! Naked!, Naked! His mouth canned. In the novel Guignol's band. (1952)