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1.
A combination of the words weeaboo (extreme anime fan/Japanophile) and derp (stupid or ignorant person).

Basically...it's used to describe a very stupid anime extremist.

Despite what some people think, there is a bit of a difference between a weeaboo and and a weeaderp.
Normal anime fan: I like Naruto! :)

Weaboo: OMG SQUEE, I LOVE NARUTO!! SO KAWAII! (/^0^)/

Weeaderp: OMG! I luuuuuuuuuuuuuuuuuuuUV animu!!! Especially this one YAOI animu called NArUto! Cuz' every1 nos that Naruto is a yaaaoi! It is KAWAII SUGOI DESUUUU ^///0///^
by Teh Coon Pwns U December 05, 2010