Noun.
1. More than the normal derp. Like a gigabyte, Giga Derp is one-billion derps. See "Derp".
2. A über derpy being, one who is derpy to the maximum.
Verb.
1. To giga derp is to either (a) troll a whole lot (b) to annoy someone very much.
2. To be a Giga Derp.
Adjective.
1. Being Giga Derpy
2. Of the Giga Derp kind
Dude I'm giga derping this game around, the other players are flipping out.
Giga derping is not allowed in this chat room