In Apparences, a man is talking to his sister on the phone. Just before the conversation ends, he remembers that he wanted to ask her something:
J’allais oublier, là… Est-ce que ça marche encore pour toi vendredi […]?
I almost forgot… Does Friday still work for you?
J’allais oublier isn’t unique to Quebec French. I think that you’ll find it very useful to learn this expression.
[Quote from Apparences, season 1, episode 7, Radio-Canada, Montreal, 21 February 2012.]