Named for the English word "gal," gyaru are young girls who dye their hair sickly shades of silver and blonde, get fakey tans and slather the makeup on thicker than Bugs Bunny in drag. They can be found hanging out on street corners in almost every major city, but the movement was born (like almost every freaky Japanese style) in the ultra-hip Harajuku neighborhood of Tokyo.
There are all sorts of subgroups of gyaru, and each successive generation gets weirder than the last.
First came the kogyaru, high school girls who wore sexualized versions of their school uniforms (supershort skirts and incredibly saggy socks) and dyed their hair blond. Once that style peaked, some girls started to go off the rails. Known as ganguro, they slathered dark makeup on their faces, painted their lips white and attached shiny stickers to their faces.
Don't look it in the eyes!