One who lives a true swagg-filled life all day every day. They are on a greater level then a "typical" bro and have a supreme roll in society. They are especially hard to come by, you will know one when you see one.
Note: the ultimate bro does not try to be a bro because it comes naturally to him.
Bro: whats up bro
Ultimate Bro: dude im chill, whats good with you
Bro: not much
Ultimate Bro: homie im gonna swagg it up in this nine peace