A serious disease which, once it has control of a person, causes them to spew forth incoherent babble from the bowels of the voicebox. Often extremely frustrating for the victim and extremely hilarious for the observer.
Compliments to Eric :-) for the examples
"Gugga blugga aorfbb999l! WimblEdon (long 'e') grrfor..bll...gll..."
"It's 90% perception! Shut up, shut up, shut up!"
<yells> "I need to know EXACTLY where your hands are!" ... "I mean the general... area..." <falls over, asleep>
<reads off paper ("flibbertygibbet" is written on the paper)> "Filbert gilbert!"