Logorrhea is a disorder of speech. It is a psychological disorder where the person speaks continuously, in gibberish or making no real sense. It is a sign of an underlying mental disorder, and needs psychiatric attention.
Logorrhea happens in many different psychiatric and neurological conditions. Some of these are glossolalia, schizophrenia, bipolar disorder, and schizoaffective disorder.
The term is sometimes used of someone who is just very talkative. This is mean to be a humorous reference.
The dramatic monologue Not I by Samuel Beckett is an example of logorrhea. So is Lucky's speech in the play Waiting for Godot.
In the 1999 E.W. Scripps National Spelling Bee, the spelling bee champion Nupur Lala won with the word logorrhea. Then a documentary, Spellbound was made about the spelling bee.