A lucky chance occurrence, like when this new boy you have a crush on in the 6th grade emails you and asks you to go to a movie and signs off XOXO and you realize just then, he has a crush on you too. That's a kawinkidink!
The supposed way Canadians say 'coincidence'. Similar to koinkidinky but less cute. Similar to koinky-dink but without the unnecessary hyphen. An awful stereotype.
Jacques: We both got stereotyped at the same time for being Canadian, what a koinkidink, Eh?