If someone called me a hoss when I was carrying limbs out in a field, what does that mean?? That I'm strong?

Yes, basically. Hoss was actually a character on an older Western. Of the three main characters, Hoss was the simplest and also the strongest (physically). However, he wasn't quite the brightest either. Think of the stereotypical, kind-hearted oaf and you see Hoss. Most people use it as a compliment, to say you're both helpful and strong. Of course, it could also mean your niave and thoughtless, heh.