Named after a famed monologue by comedian George Carlin, this short 2008 work by Steven Pinker delves into the linguistic basis and evolution of swearing. It turns out that swearing seems to be controlled by the basal ganglia, which means that, like music, it often lives on even in states of aphasia beyond basic language and sentence construction. That means it's hardwired, and it relates to religion, cleanliness and sex, evolving towards the latter as the former ceased to have the same pull it had in the past. Why do we do it? Well, it turns there are a number of very good reasons for creating oaths and taboos in our social/professional development and the Church and its paraphernalia was right there, on hand to support us in the past. Now we have to use the law quite often, or the law plus oath, to create the sense of solemnity.
Pinker is always erudite and readable, and here picks just the right size of book to whet the intellectual appetite, so to speak. The use of swearing, its power in circumstances and lack of power in others, is discussed here, leaving us with the sense that while we are right not to fall back into the overly restrictive codes that stifled expression, we also need to have some sense of what purposes we have subverted in the meantime by being unable to use the same strictures on the imprecations that have been confined to our basal ganglia.
One point he makes is that in the past religion provided the gravity that, say, swearing on the life of one's child might replicate now. There was a code in place that one would not break easily, just in case there really was an afterlife whose pitch we could be queering with some petty selfishness... Meanwhile the interjections that we all know and love came from potentially dangerous health-related situations. A pile of shit was a possible source of plague, after all. Sexual acts carried, and continue to carry, more risks than we might be really considering in the heat of the moment, whether physical, psychological or merely philosophical. Swearing is also a manner of creating camaraderie or shared tone, such as in a mining camp or military units.
In linguistic terms, it is amazing how much you can tell about a person from their choices of words and their deployment of swear words. Indeed someone using a refined tone with a single swear word draws the appropriate attention to whatever is being highlighted, while someone who swears with every second word numbs their audience and loses trust. To avoid swear words altogether in a swearing environment is like a musician joining a jazz band and trying to play without syncopation. It just won't sound right. Then again, swear words in a mouth that doesn't generally use them is also something exceedingly strange-sounding. These are some solid reasons for all of this, and Pinker sketches out the issue with rigour and a touch of humour. And brevity.