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Multi-purpose French verb, roughly equivalent to "Fuck" in English.

Etymologically, means to "accidentally pull out of the vagina during intercourse".

In its current use, it could mean :

* To kid, to tease, to fuck with somebody.
* To goof, mess, kid, dick, or fuck around (or about).
* To be dysfunctional, or fucked up.
* To make a bad (though funny) mistake, to fuck up.
To fuck with somebody :

- Hey, Bob - how's your room ? Cleaned up already ? Your mom says she'll come up in 5 minutes.
- (panicked yell) FUCK !!!!!!
- Naaah, je déconne :-D !

To fuck around :

- Yeah ... about Scott ... he's been dicking around for 15 years = ça fait quinze ans qu'il passe son temps à déconner ... Maybe that would not hurt him to get a bit serious, for a change !

To be fucked up :

- Hey, Matt, heard about the latest decision of the Supreme Court ? They ruled that a Corporation is a person with freedom of speach, and therefore should be OK'd to donate to an electoral campaign.
- Putain, ils déconnent sec, ceux-là !

(alternative) :

- Putain de bordel de connerie d'écran de MERDE !!

- What's going on, Ryan ?
- That fucking CRT screen ... il déconne encore !

To fuck up :

- So Spud showed up high at his job interview ...

- Oh jeez :-D ! C'est déconneeeeeer !!
Déconner by Blues Buster January 22, 2010
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A french slang word, meaning "to talk bullshit".
Arrête de déconner
déconner by Fanshao September 21, 2009
Related Words

deconversion 

To abandon one's former belief system.

To become an atheist.
Her deconversion narrative helped others to come out as atheists.
deconversion by The Autarkist December 30, 2014

deconversión 

Abandono de la religión de uno.
Acto de volverse ateo.
Gracias a su testimonio de deconversión, otras personas salieron del armario como ateos.
deconversión by The Autarkist December 30, 2014

sans sheriff 

Lawless use of fonts or typography, with no regard to aesthetics or legibility
I'm putting this CV straight in the bin. Written totally sans sheriff.
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Breadhead 

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A breadhead is like a crackhead, but for money instead of crack.
Breadhead by 🅱️ U S 3 4 8 March 30, 2022

Stink lines

As seen in illustrations or cartoons: Wavy, vertical lines rising above a person, place or thing. Denotes a foul odor.
"You didn't put enough stink lines on your picture of the teacher."
Stink lines by Athene Airheart March 14, 2004