It's quite likely that your son does have a tic disorder of some sort, and this warrants evaluation by a pediatric neurologist. There are a number of conditions that might result in such verbal and motor tics, among them Tourette Disorder. Have it checked out - you'll be able to help him. Try not to say things to him that might hurt his feelings. Tics are involuntary behaviors, and they cannot be entirely regulated by a person's 'will'. The saying "Where there's a will there's a way" does not apply to children who display involuntary movements or behaviors.