Word salad
Definition of word salad taken off wikipedia

In the mental health field, word salad (originally from the german Wortsalat) is used to describe the symptom of confused, and often repetitious, language that is symptomatic of various mental illnesses. It is usually associated with a manic presentation and other symptoms of serious mental illnesses, such as psychoses, including schizophrenia. It describes the apparently confused usage of words with no apparent meaning or relationship attached to them.

e.g. the question "Why do people believe in God?" elicits a response like "Because he makes a twirl in life, my box is broken help me blue elephant. Isn't lettuce brave? I like electrons, hello."

If you still don't get what this tasty sounding symptom is, you can view this highly entertaining video of james spader frm boston legal and you'll understand.

http://www.youtube.com/watch?v=gKHDzdwVa4c