Interjection. An allusion to the YouTube video the ShaqSquatch in which an episode of Ghostbusters is voiced over with hilarious lines making no logical sense. Used by one when a very unfortunate occurence is avoided by chance alone.
This term was originally used during slavery or by slaves. The salve master would come to the slave "house" and take liberties with the female slaves. Though the term was not usually said to the "masters" face, if it was said that the motherfucker was coming it was known what was meant.
(The term applied to slave masters or anyone that had authority over the slaves. Slave Masters, Their Sons and overseers).