Bob, Gen, Gron, Het, and Slash

Based on conversations I've been having with you guys after Writercon, I wonder if it might be useful to separate out the question of definitions from some of the other things we've been talking about. I'd be interested to see the range of definitions for these terms laid out clearly.

So, pretend this is Twitter. In 140 characters or less for each, Tweet me your definitions of bob, gen, gron, het, and slash (and any other words you regularly use to label your stories according to sexual or romantic content).