Reactions and exclamations
Genre !
Right? / No way!
C'est ouf.
That's wild. (verlan of fou)
Carrément !
Totally! / For sure!
Grave !
Seriously / 100%
Putain !
Damn! (very common, mild)
Je rêve !
I can't believe this!
Mince !
Darn! (clean version of zut)
N'importe quoi !
That's nonsense!
Everyday people and things
Un mec
A guy
Une meuf
A girl / woman (verlan of femme)
Un pote
A buddy / friend
Mon gars
Bro / dude
Une caisse
A car (informal)
Un boulot
A job
Une clope
A cigarette
Un truc
A thing / a thingy
Money
Du fric
Money (cash)
Du blé
Money (literally "wheat")
Des sous
Money (cute, family-friendly)
Ça coûte un bras.
It costs an arm and a leg.
C'est cadeau.
It's free / a gift.
Time and quantity
Vachement
Really / very (cow-ly!)
Plein de
Tons of / loads of
Direct
Right away / immediately
Tout de suite
Right now
Tout à l'heure
Later today / a bit later
Tranquille
Chill / no rush / fine
Reactions to people
Il est relou.
He's annoying. (verlan of lourd)
Elle est chelou.
She's sketchy. (verlan of louche)
T'es chaud ?
You up for it?
T'es un crack.
You're a champ / killer.
Tu te fous de moi ?
Are you kidding me?
Lâche-moi !
Leave me alone!
Filler words (use these constantly)
Du coup
So / consequently
En fait
Actually
Bah / Ben
Well…
Bref
Anyway / in short
Tu vois ?
You know?
Quoi.
…you know. (sentence-final)
Eating and going out
J'ai la dalle.
I'm starving.
On se fait un resto ?
Wanna grab dinner?
On se boit un coup ?
Wanna grab a drink?
Je suis crevé.
I'm wiped out.
J'ai la flemme.
I can't be bothered.
C'est nickel.
It's perfect.
How to deploy these
Don't try to use slang for the first time in front of natives — it will sound forced. Memorize the ones you like, hear them in real audio so you have the rhythm right, then deploy one or two at a time as they come naturally. Slang is a confidence game; over-using it backfires more than under-using it.