
WTF!%^???!!! When you hear a kid blurting out these words or far more obscene and inapproriate remarks at you chances are A) the kid’s obnoxious by nature B) he’s possessed by the devil C) he’s suffering from Tourette’s Syndrome.
If it’s A, go and hunt down his parents. They ought to teach their kids some manners. If B, hire an exorcist. C is when we, doctors, come in, as Tourette’s syndrome is an inherited neurological disorder with common onset in childhood, characterized by multiple facial and body tics. It is often associated with exclamation of obscene words and taboo remarks. Multiple behavioral and developmental problems like Obsessive Compulsive Disease and Attention Deficit Disorder are also co-occurring features of the syndrome.
It can be a chronic condition to last a lifetime but most patients experience the worst symptoms in their early teens. Improvements are noted during late teens and adulthood. As if random curses are not enough, the patient may be grimacing, squinting, hopping, twisting or punching himself in the face. Be careful not to get him excited by offering yourself as a sparring partner, for tics are worse with excitement and better during calm periods.
The exact etiology is still unknown but is deemed to be as complex as the manifestations. No definitive diagnostic tool is available either. It’s a diagnosis of exclusions. Don’t hastily dismiss a nagging wife spurting out vulgar words or a pole dancer twisting herself as a Tourette case. Diagnosis is made after verifying that the patient has had both motor and vocal tics for at least one year. 
Unfortunately, there is no single medication that can completely eliminate symptoms. Since most individuals improve in their late teens or adulthood, some may no longer need medications for tic suppression. Neuroleptics are the most consistently useful medications for tic suppression. However, side effects can get in the way. These can be lessened by initiating treatment slowly and reducing the dose when side effects occur. Treatments aimed at the associated neurobehavioral disorders and psychotherapy are likewise employed in the management of TS cases.
Although tic symptoms decrease with age, it is possible for neurobehavioral disorders such as depression, panic attacks, mood swings, and antisocial behaviors to persist and cause impairment in adult life. Constant support from family and peers are necessary. Relatively, without the involuntary movements and verbal attacks, these should prove to be convenient enough.
http://www.ninds.nih.gov/disorders/tourette/detail_tourette.htm