rave: vi. [WPI] 1. To persist in discussing a specific subject.
2. To speak authoritatively on a subject about which one knows very
little. 3. To complain to a person who is not in a position to
correct the difficulty. 4. To purposely annoy another person
verbally. 5. To evangelize. See flame. 6. Also used to describe
a less negative form of blather, such as friendly bullshitting.
`Rave' differs slightly from flame in that `rave' implies that it
is the persistence or obliviousness of the person speaking that is
annoying, while flame implies somewhat more strongly that the tone
or content is offensive as well.