(Nobody smart has ever been called a hoss, it is not a compliment).
They may also be called chuck, chauncey, or carlitosway.
2) what you say to someone who is lagging or acting like a girlpie for any reason... for ex, say someone is trying to make an excuse for why they cant do something when they really could, you say "hoss' hoss- hoss." in the middle of their sentence to let them know that you know they are bullshitting you.
yo son you're the biggest hoss on the block