A term used by African scam artists (specifically of the spam variety) to describe the people they get money from. Literally translated, it means something like "big idiot."
I've got another five thousand messages from Nigerian losers who think I'm just another mugu.
by The Grammar Nazi November 17, 2003
A typical slang much famous in the english speaking region of west Africa. It is used in refering to a victim of a fraud or to a person who is duped of his/her money, especially through the internet.
The white man wasn't clever enough to know that he was falling mugu to the pranks of those boys.
by Mactito July 03, 2010