So FI and I work in the same building and when we see each other or are having lunch together we will sometimes use our "special" term of endearment for each other (not the typical "babe" or "hon" that we use on a regular basis at home). And sometimes co-workers will overhear it and find it amusing.
So I figured it could be fun to hear everyone's terms of endearment on here :-) Nothing uber-personal of course (unless you really feel like sharing!)
For us, he calls me a "Portugeek" (I'm Portuguese) and I call him an "Ecuadorkian" (and he's Ecuadorian) :-D Aren't we just clever ;-p