Noun. Someone who performs exceedingly well at the beginning of a course, but fails to continue to do well.

Verb. To do very well at the beginning of a class, but do poorly later on.
Dude, Mike totally aced that first exam, but then nirbed out on the final.

Yeah man, Mike is such a nirb.
by The Nirbster November 27, 2012
a really hot short girl
That new girl is such a nirb.
by ldksjbf September 05, 2007

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