A person who resembles a rabbit in appearance (Big ears buck teeth) and/or personality (hyper and jumpy). In short rabbit + Person = Ridian.
Dude, stop eating all the carrots! Dont be such a Ridian.
Person 1: Hey have you met Paige?
Person 1: That chick with the buck teeth and big ears.
Person 2:OH! You mean the ridian.