kwim = Know What I mean -- and that one stumped me for a while to.

And let's not even get into some of the text message abbreviations.
1. What time to you go to bed? I'm an early riser, so typically in bed between 9 & 10. I get up before 5 and we're out the door by 6 Mon through Fri.
2. What was the first abbreviation (i.e. TTC, WTTC, BFP, AF, etc.) that you had to look up without figuring it out on your own? I was floored by all of them, and I too looked for a list right away. I think the very first one was AF.