A motherfucker is someone who is annoying or frustrating, often in a way that's hard to ignore. It can also be used as an exclamation of surprise or strong emotion.
You might hear someone call another person a motherfucker if they're being really obnoxious or getting on their nerves. For example, "Dude, stop playing your music so loud, you're such a motherfucker!" This kind of use is often informal and can be considered impolite in some situations. In other cases, the word might be used more as an expression, like when someone spills coffee all over their shirt: "Oh, motherfucker!" to express frustration or disappointment. It's not typically used to refer to a person who has just done something kind or helpful.
(strongly vulgar) An extremely contemptible or mean person.
Example: Up against the wall, motherfucker.
