When a woman (sometimes a man) attempts to achieve that trendy look, the messy bun but it ends in extreme failure thus creating a saggy mess on the persons head. The majority of the bun is is still in tact (barely) and the rest of the hair is loosely hanging out of the middle of the bun. This hair somewhat resembles the body and tail of a sewer rat that has rabies.
by ratnsackgirl01 June 11, 2018