1) Also known as Insectiside. Krobb is a tryhard troll residing in Norway, primarily known in a PS3-exclusive video game LittleBigPlanet 2. His techniques are pretty poor and, by using them, he rarely success. His age is currently unknown, but it's obvious that it ranges somewhere between 14 and 16.
2) Another name to describe any tryhard/fail troll, called after an above individual. It is mostly used in online LittleBigPlanet 2 community.
1) "Have you heard of Krobb? He's such a fail troll, he just spammed my profile trying to look stupid."
2) "Hey, that krobb is moving my levels! Still funny how he wastes his time doing that!"