My guess would be it's a type of signalling similar to "how do you do fellow kids?" a la Steve Buschemi; in other words, for relatability. To the layperson, thr

My guess would be it's a type of signalling similar to "how do you do fellow kids?" a la Steve Buschemi; in other words, for relatability. To the layperson, throwing in a curse word signals to them that it's not going to be some dry text that they'll be reading, but rather something more palatable. Another commenter mentioned shock value, which doesn't seem far off. A little taste of shock is what jolts the reader's attention. With that said, it should be used sparingly (if at all), otherwise the message loses eloquence and the intended expression is diminished by vulgarity. Someone also once said that using curse words makes people dumber and lazier because they end up using curse words in place of more descriptive words, which I tend to agree with.