How did Corey from Pawn Stars get the name Big Hoss?

The name "Big Hoss" is actually a nickname that Corey got from a childhood friend. When he was a kid, Corey was very large for his age and his friend started calling him "Big Hoss" as a joke. The name stuck and has been used by his friends and family ever since. Pawn Stars fans also quickly picked up on the nickname and it is now commonly used to refer to Corey on the show.