rave
[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 evangelise. 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.
[{Jargon File}]