Used most commonly by Canadian high school students, Franglais (French + Anglais, known also as
Frenglish) is a mixture of the two languages in order to suit
a) the speaker's knowledge of the language
b) the speaker's laziness in regards to full translation
or c) the speaker's desire to piss off their French/English teacher.
Franglais has been known to be a diplomatic language between Quebec-the rest of Canada students, and students capable of speaking balanced Franglais are generally considered to be bilingual.
Je suis fluent in Franglais.