No, Toni, not dumb.....just not up with the latest slang !
"Newbie" can be used as a term to identify newcomers to a game, place, or organization. The variant spellings of "newbie" are also used, especially in online games and gaming forums, as a catch-all insult regardless of the recipient's actual skill or experience. Someone who acts like a "newbie," but isn't one would be referred to as one of the variant spellings. The variant "noob" has become common in spoken English by juveniles. Alternate spellings include "newb", "n00b", "noob", "nooblet", "nub", "nib", and the recently popular "nublet" and "nubcake". These alternate spellings of the term, other than "newb," inherit the definition of "newbie" but are generally used in a derogatory manner to indicate uselessness because of the ignorance associated with being a newcomer." (Wikipedia )