look up any word, like nanu nanu:
 
1.
A gross and terrible guitar sound, formed by combining flanger and reverb effects.
Oh man, she's using flerb? What is wrong with her?
by prototeutonic@gmail.com November 11, 2010
 
2.
A sound Batman makes while fighting evildoers
And then Batman was like... "Bang... Pow... Flerb!"
by A concerned citizen in america November 09, 2009