I always took it as being:
 "ba bah bah bun (brief pause) Lets Get Busy!!"

> Here's a question that has plagued myself and my friends for 
> sometime - in the Tenchi Special (The Night Before the Carnival)
> Washu "borrows" Tenchi for some scientific experiments. At one point
> she dons a nurses outfit to get a special sample. At that time in the
> background can be heard a fanfare (ba bah bah bun) and then some dialogue, what

> is being said here? It's the same on both the Japanesse and English
> audio tracks, but it is not displayed on the Laserdisc's subtitles.
> On the disc it is around time code 15600. Please help! -- David

> Genesse