There's a science fiction novelette by Janet Kagan called "Fighting Words." It involves interactions between humans ("Erthumoi" in this future universe, "Erthuma" in the singular) and Crotonites, a winged species of sapients who believe that their ability to fly makes them superior to all other sapient species. They tend to call Erthumoi "slugs" to make this contempt really obvious.My friends and I call each other Boob too. It was a weird thing that started in high school when I called someone a boob as a teasing insult and everyone thought it was the lamest insult and we just started calling each other that all the time.
In the story, a local Crotonite ambassador has made friends with some of the Erthumoi and has begun an insidious campaign to convince his entire staff that an even better (i.e. worse) insult is to call the Erthumoi "sluggers." As he tells his closest Erthuma friend, Harriet, "What's funnier is that no Erthuma can tell them different: it's my word against yours."
Margret