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1.
describing something very cool or awesome
dude your new set of wheels is like totally awesome!

very neb-yoo-larr indeed!
by bonzai January 12, 2004
 
2.
An alternative to stellar. Implies a more spectacular "coolness" to the described entity/event.
That BWM is nebular, man!
by Michael Nelson July 22, 2004
 
3.
The name of a specific region that applies to basically everything found in outer-space, especially those with planets inhabited by Stargate nemisis aliens.
I cussed out my lab partner for defending his Stargate from an alien invasion from the nearest Nebular.
by Luke Pro February 20, 2007