French Slang and Colloquial expressions

it is polite, it is not formal, that's all, but you can't say it is not polite.

i am French from France and if you say it is not polite, read the title first, it is about SLANG vocabulary!

Thank you!!!! Very, very nice. I learned a lot!!!!

I've never heard "entraver" instead of "comprendre"' or "à toute berzingue" instead of "à toute vitesse". Sure, a French man can understand it, but according to the regions, the slang changes, and too much slang make the sentence disagreeable to ear.
Plus, this script is not polite at all, only speak like this with friends. But, anyway, it is not beautiful to ear, for a French man, at all.
(PS : I am Parisian, I don't know where is this video maker from)

wooow .very nice thanks a lot.. :)