Also means
to talk nonsense
Usage Note
Déconner is a crude but very common informal verb meaning to act foolishly, joke around, or talk rubbish — roughly 'to screw around' or 'to bullshit'. It is too vulgar for formal contexts, where plaisanter ('to joke') is the safe choice. Sans déconner ('no kidding') is a very frequent interjection.
Examples
"Arrête de déconner et sois sérieux."
Natural Translation
Stop messing around and be serious.

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