kid #1 - Yo, Justin is the biggest coolbag on the planet.
kid #2 - Dude, I know, right?
(in public place)
Kid #1 - Justin is the coolest kid in the world. He's totally hanging out with us sometime.
kid #2 - Oh, for sure. I love having that kid around.
a person who does foolish acts that in their minds may seem cool but in the eyes of everyone else is lame
a person similar to a tool or thinks they are "all that"
-"I know he is such a coolbag!"