(idea) by Kielziz Tue Aug 29 2000 at 19:05:28
The pronounciation I prefer is:

"vrp a vrp a vrrrrp," as pioneered by JerkCity.

Variants of this, such as "wikka" and "jikkie jikkie jikkie" also make for a good effect. But there just ain't nothin' like a good old vrp.
I like it!