A combonation of two languages: Français and Anglaise (French and English).
Franglais can be either a French conversation peppered with English words, or vice versa.
It is commonly used by French teenagers.
It does not necessarily mean that they have forgotten a word, although using Franglais is a good coverup if they do forget the translation of some words.
The words used DO have proper translations.
Gina: Ah mon amie, veux-tu un beer?
Moi: Non merci, je suis le stuffed. As-tu regardé le episode de Newport Beach hier?!
Gina: Mais bien sûr! Ben McKenzie est un hunk hein?
Moi: Je pense que obviously.
French Canadian: So I was skanking the other night at the show, hein?
American: What? Huh?
French Canadian: Yeah, it was rellin, hein?
American: I am confused!
French Canadian: Why am I even talking to you?