Noun

1. An extremely undesirable person, even worse than a fucker.

   Up against the wall, motherfucker.

2. Any person, often but not always with the connotation that the person is disliked or is threatening.

   Check out this motherfucker.

3. An extremely intense experience, often but not always negative.

   War is a motherfucker.

   I jammed my finger in the door yesterday. It hurt like a motherfucker.

   You mess with me, and I will come at you like a motherfucker.

4. A good very close friend or relative.

   How’ve you been, you crazy motherfucker?

5. One who engages in incest with his mother.