“What's pressured speech?”

This is not a speech pathology related condition. It is more related to psychiatric problems. I am not the best person to comment on it. It is a very fast paced speech which is due to how the individual is feeling at that time. It is difficult for people to understand. This is not the same as a fast rate of speech as in a condition called Cluttering which is treated by Speech pathologists.

Pressured speech is an extreme need to talk and impulsively share ideas, thoughts, comments, etc. I recommend seeking a psychological evaluation for further assistance.

That's a term I've heard in the field of psychiatry and not in my scope of practice. I would recommend if your son is not already being seen by a speech language pathologist and you are concerned about his communication, to have him complete an evaluation by a speech language pathologist. If your physician can refer you to one that would make it easier for you with the outpatient setting. but you can also try your hand at a private practice.