It's a form of dishonor. Usually done by someone other than the Samurai himself.
You can braid it, put it in a bun, or in a pony tail .
A person typically has hair under a pony tail. Under a pony's tail is their anus which is where they defecate from.
to brush it or comb it. usually to comb the mane and tail
Looks like the tail of a well-groomed pony.
pony tail
it looks like a horses tail, obviously.
the Chinese king had a pony tail too
brushing the mane and tail of your horse/pony
up in a pony tail
put it in a pony tail
Emery
pony tail