The group of girls(sometimes boys) that were either not popular enough, not skinny enough, not limber enough, or not bitchy enough for cheer leading. Often seen as the bands add-on, the color guard is either terribly bad and thinks their hotter than the forth of July, or so good that they can only think about becoming better. (These ones usually have more than three guard captains/coaches and are either college or professional color guards)
Hey did you see the color guard at our performance last night?
Their the chicks that throw guns around durring the show.
Oh...yeah, they kinda sucked...