a person that will do anything for attention; a flashy or flamboyount person; someone drawing attention to themselves; (like a flashy advertising banner online)
-Dude, your girlfriends' a total banner.
-Why's that banner doing naked cartwheels?
-You can see her nice ass in her miniskirt, man I love banners.
-Check out that guy shouting in his cellphone, what a banner.
-That blond chick was such a banner in high school.