1. a tough guy
, a superstar
. Basically used to refer either ironically or jokingly to one of your boys. 2. Alternately may be used to refer to a guy whose name you forgot.
1. "Hey chieftain, are we going to the game saturday or what?" 2. guy: "Larry, hey, remember, we met at that wedding last summer?!" you: hey chieftain, good to see you. Let's catch up soon."