I've mentioned this before but my wife and I call each other B and D. (She's B, I'm D).
We're so lazy that we can't expend the effort to use multi-syllabic words.
It's a step up for me though. I used to be too lazy to talk. I'd move my finger back and forth vertically to signify yes, or horizontally to mean no (like shaking your head only less work).
