where guys call each other motherfucker when they greet each other. They are not being insulting to each other and it is a display of affection. The difference between this and an insult is in tone of voice and body language ect.
Man 1: hey I haven't seen you in a long time. You doing motherfucker?
Man 2: just fine. How are you doing motherfucker?
And that is an example of a motherfucker greeting.
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