1. Last name given to someone who is completely epic.
2. This title can be self proclaimed or given by a friend or friends. Unless one has experienced a McBeastin, one may not name a McBeastin.
audrey: WOAH did you see that?
athena: OMGZ YAH! nanners attacking the innocent guava?!
ariel: poor guava fruit!!!
jackie: nanners is SUCH a Feisty McFeist Burger...but we still love him!