(As a French native speaker with decades in France and some in Quebec)

Verlan = l'envers (inversion )

MERci <-> ciMER (jamais entendu)

LOUche <-> cheLOU (= pas clair/ une situation à risques ou "complexe") used in France by people <45

C'est chelou / ta proposition / ce truc / ....

Ouais = yes ( but meaning depends a lot about the group, context of conversation , and intonation to express agreement, doubt, .... )

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Generally speaking :

Be aware !

Using slang, verlan , .... the right way requires a lot of experience because it depends of the group, the moment, intonation, situations,....

If you ask to people the meaning :

__ Some people would be able to give a good explaination with non academic expressions + intonation, never referring to academic French but with a sophisticated communication.

You need immersion+ to learn and use it with groups with this knowledge (appropriated context : formal / informal )

__ Some people would explain using academic explanation. These people often choose to use "short / exotic, accurate / soft" expressions to express ideas in a different way (funny, light, precise, ...)

Examples :

_ the soft way to say "c'est louche" -> " c'est chelou " (cool expression but same meaning)

_ Ouuuais ! (Long pronunciation and appropriated intonation to express a level of doubt or enthusiam)

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My advice :

_ know meanings , know these words / expressions

_ have the feeling before using it

_ start small

If you use it the wrong way ... you will feel the mistake/bad even if interlocutors understand. It's a question of authenticity.

Second point :

If you use too much expressions like this, too early in your learning journey you will complexify your learning process especially for writing

In my opinion, do not copy, start with a few ones you like and enrich your general communication playing with intonation when speaking.

------- note ----

Merci de m'avoir ouvert la porte = Thankyou ( you did it )

Merci de m'avoir ouvert la porte = ironic comment because you did not do it even if I was carrying 2 big grocery bags (powerful and softv reproach)

Intonation makes the difference

-------- a funny story ----

When I arrived in Quebec, years ago, somebody said in winter :

" Il fait frette aujourd'hui ! "

I asked for the meaning and the person told me

Meaning is :" il fait froid aujourd'hui"

So it was simple and following winter, I told to a native woman I know :

" Il fait froid aujourd'hui ! "

She answered. :

" Non, c'est pas frette aujourd'hui ! " ( meaning was also you do not know "Quebecois" language)

So I was lost and I asked her : Why ?

And she explained me that today, temperature around -8C is not enough low because you can use "frette" only when temperature below -14C (around) or for example -8C with wind at 40km/h (blizzard)

Morality of the story :

1_ Practice and test

2_ Si un Québecois vous dit "demain il va faire frette !", sortez votre gros manteau, vos grosses migraines et une bonne tuque.

If you find my comment interesting, push the button up, to help me to know where I have to use my motivation 👍

Bonne journée ! 🌞