Used in the tv series Lone Ranger, Kemosabe became a very popular term. It means trusty scout or faithful friend. Contrary to popular belief, this term is actually native american. This term can be used while talking to friends or brothers. It can also be used sarcastically when talking to an unloyal and unreliable person you don't like.
John: Hey Kemosabe, long time no see. Did you do my favor.
Mark: Of course I did bro!
A phrase that’s been around since the mid 90’s, made popular by the Big tymers, often mistakenly attributed to some young fuck who made a song about the phrase last year