General terms:
* Rave: To talk in an excited, incoherent, or rambling way.
* Rant: To speak loudly and angrily, often in a way that is illogical or unreasonable.
* Spout: To speak rapidly and without thinking.
* Blabber: To talk excessively or indiscreetly.
* Gabble: To talk quickly and incoherently.
More specific terms:
* Delirious: To talk in a confused or irrational way, often due to illness or fever.
* Incoherent: To speak in a way that is difficult to understand.
* Rambling: To talk in a way that is disorganized and meandering.
* Effusive: To speak in a way that is overly enthusiastic or emotional.
* Exuberant: To speak in a way that is full of energy and excitement.
The best word to use depends on the specific context and the tone you want to convey.