how apropo

so being the smart ass that I am ive been using this word quite often lately...incorectly apparently.
"how apropo of you my good sir"
"wow thats a really nice apropo over there"
"hey can you pass me the apropo for my fries" etc etc etc
I ve been using it with friends. colleguesss. everyone. in meetings. in court. everywhere.
i thought it meant "appropriate" or some shit but my pal just told me that it means something stupid in french. fuck ive looked like such a dumbass. stupid. stupid stupid stupid. ill never live this down guyz.
http://en.wiktionary.org/wiki/apropo