I tried to look up disorganized thinking on the internet and all of the sites referenced Schizophrenia - apparently it is a symptom of.
I copied and pasted the site and the quote. http://www.mayoclinic.com/health/disorganized-schizophrenia/DS00864/DSECTION=symptoms
"Disorganized thinking causes illogical, nonsensical thought patterns. This disorganization is also noticeable in the way an affected person talks. A person with disorganized thinking may not be able to stay on track in a conversation, instead jumping from one unrelated idea to another, so that it's impossible to understand what the person is trying to say. Making up words is common. Written communications also are very disorganized."
I hope this information helps some.