There’s a Canadian at my school whose favorite word seems to be keif, which he uses instead of nasty or gross. He swears it’s an English word and he doesn’t know how to spell it either. Another Canadian teacher (at another school) who’s a friend of the first Canadian also swears it’s an English word and also doesn’t know how to spell it. The spelling I have above is just my guess.
So, what language is it really from and what does it really mean?