Belgium· informal
carabistouille
Meaning
a made-up story, told for fun
Elsewhere
blague
Explanation
Standard French would call it une blague. Belgium and the far north of France have a word of their own for the harmless fib, usually heard in the plural.
Example
Arrête de raconter des carabistouilles, on ne te croit plus.
Stop telling tall tales, nobody believes you anymore.
Origin
From the Walloon carabistouye, meaning a joyful lie or a bit of nonsense.
Where
Belgium
Nord-Pas-de-Calais, Picardie
Source