A top knot bun is a bundle of hair wound into place on the top of your head. It's an easy hairdo for anyone with hair that is at least shoulder-length or longer. For those with braided locks, there is also a version of the top knot provided here.
Hair How To: Messy Topknot Bun
My Messy Top Knot / Bun: Tutorial
Messy Top-Knot Bun Tutorial :)
Really Messy Bun / Top Knot Tutorial
Easy High Messy Bun!