A nut in which many people are allergic to and may possible die from. Also a person typically someone that is brown in color (since hazel is a shade of brown), that is short typically the shortest person in the room, that is also very outgoing and probably one of the greatest of friends a person could ever have.
Martin: Is that an Apple Pie!
Haider: No it is a hazelnut pie.
Martin: Oh looks like I can't eat that then.