History

Its etymology is uncertain. It may derive from "newie", which is attested in U.S. and Australian sources of the 1850s and means a neophyte in a place or situation; alternatively, it may derive from the British public school slang "new boy" or "new blood", which is attributed to the same era and was applied to a schoolboy in his first term.[4]

In the 1960s–1970s the term "newbie" had a limited usage among U.S. troops in the Vietnam War as a slang term for a new man in a unit.[5] Its earliest known usage on the Internet may have been on the Usenet newsgroup talk.bizarre.[6] The term is believed to have entered online usage by 1981.[7]

Where & how does the term newbie come from? Sounds strange. In ordinary life, we use words like rookie, novice or neophyte. I never heard of this word until I joined this community. Is it a special word for this hobby, kind of like DATY, rimming, etc.?

it means an " inexperienced newcomer"..i think Webster has it right..

put your foot in your mouth or worse yet, say something or do something that your date considers a no-no and then leaves on you.

The Hobby did not invent the word... it just adopted it.