1. adj: Having a lot of fail, very/really stupid.
2. n: One who is very stupid, or who fails a lot at life.

From the words "hella" meaning: "a lot of, very, really," and "derp" which is often said after one has failed, pretty much meaning: "Something that was stupid/dumb,"
1. "Can you believe that helladerp test had 50 questions completely unrelated to what we were studying on it?!"

2. Person A: "Dude, I walked into a synagogue the other day wearing a swastika t-shirt and shouting "Hail Hitler!" lol Everyone looked at me like they were going to kill me!"

Person B: "...You're such a helladerp."
by kai713 January 23, 2011

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