A mugu is someone who takes orders from black person. It is the term used by 419 e-mail scammers to describe their victims. It means "fool" in Nigerian. And if you get tricked by something as retarded as a nigger, then 'fool' is the kindest word for you.
Scammers use the word "mugu" or "guyman" to mark which guestbooks they use to fish for e-mail addy's, so the other black person don't hit their same targets.
After leaving a comment on a fake account, you'll receive some e-mails from the scammer. Respond to those e-mails, and you'll get free money!!!
Examples of mugu
See also: I go chop your dollar