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1.
Represents a variety of emotions or vague feelings: sick, bored, etc. Sometimes used in texting when one has nothing else to say.
I've been feverish all day and there's nothing on TV...blerb....

Blerb.
by puellaignava October 30, 2011
 
2.
Basicly it's a mixture of bla, meaning boring and burbs meaning subburbs.
Yeah I live in the blerbs... It kinda sux.
by Fireborn February 06, 2006
 
3.
A cool blue amoeba thingy
We were dissecting blerbs today.
by GaGu March 23, 2007