Variant of white belt. A faddish, retro item that is momentarily proclaimed as fashionable but abandoned just as quickly. Also, someone who leaps on these trends in the hopes of being seen as cool, or who still follows the fad after its (brief) popularity has faded.
"Don't be such a white plastic belt; Trucker hats are out, and acid wash denim is never going to come back. Give it up."
"Facebook is just the new Friendster; people will start dropping it faster than a white plastic belt."