1 definition by Welton
A traditonally African-American portmanteau for "Mother Dear," and, more famously, an alias of Mabel Simmons, a fictional character created by Tyler Perry who, although she is an elderly grandmother, carries at least five guns in her black handbag at all times, smokes copius amounts of marijuana, and causes bodily harm to/murders people when they upset her. Her most notable catch phrase is "I ain't afraid of the po-po!" Can also be used in the phrase "to go Madea on" to mean "to go off on/violently attack."
He said that I looked like an old gorilla and had no class, so you know I had to go Madea on him: I broke both his legs and ran like hell!
by Welton June 26, 2006