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1.
Flatulence brought on by anxiety.
Me: "What's wrong; why are you rubbing your gut?"
Friend: "You know that speech I have to do later, its giving me nerve gas."

Me: "Have you got your exam results back?"
Friend: "No, I've got nerve gas as a result."
by Veritas479 July 15, 2011
 
2.
an air biscuit so rank that it causes others to twitch and run covering their mouth.
Man, that mexican food has really tore my stomach up. I'm about to let out some serious nerve gas!
by Airius December 30, 2008