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In the original Star Trek series, whenever the main engines (warp drive) broke down (which was pretty frequent) the Enterprise would only be able to move using "impulse engines" - a low power, sub-lightspeed manouvering system based on a small fusion ram/ion drive.

By inference, someone described as "running on impilse engines" or "impulse power only" is either:

1. Very tired (a.k.a. 'running on empty')

2. Genuinely ill

3. (derog.) Slow and/or stupid.
"Jesus, I've just had to brief the sales guys on the new product.... they're all running on impulse engies up there".

"You want to go for a beer ?"

"No, man, I'm running on impulse engines... got to go home and grab some sleep."
by Eighth of Seven May 09, 2007
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