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1.
a person of such dangerous capability that it produces a natural coolness about them, which when those two qualities combine (coolness and danger) create a reputation that is renowned. They exude these qualities in every aspect of day to day living, therefore leaving their mark on society in legendary form.
Samuel L. Jackson is a bad mofo.
by G_Shock52 May 04, 2009
 
2.
one bad Mother fucker. Me
badMofo: you just got fucking owned
nub: damnit :( imma nub
by badMofo2189 October 18, 2006