Pronunciation: 'Vaj-noob'
A Vagnoob is a person so unfamiliar with the vagina, that the first time they see it they smile uncontrollably and geekishly, like a typical character from a teen-comedy.
(While in the bedroom)
Boy: Wowzers! I didn't know it looked like this :D
Girl: Eugh, get away from me! I didnt know you were such a Vagnoob!
adj, n, v. Usually refers to a female, sometimes a female teacher, who nobody likes. Some synonyms can include "stingy", "penguin", or "waddle waddle".