[fr > en] québéquiennes/québéquiens v. québécoise/québécois - Lemmy.ca

I feel like a dummy for not knowing this as a Canadian, but is there a difference between the two? I’ve actually never heard of québéquien/nne before. Also, in the picture, there is this caption: vieux fumet “sueur d’avion”. Does that mean he reeks of airplane smells?