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Meaning 1

Beginner - new or inexperienced person at a job or situation, (can be an insult but usually just a description)

Context 1

“Hi, are you the newbie?  My name’s Sarah, how are you going?”

Meaning 2

(same as Meaning 1)

Context 2

“Who left the coffee machine on?”
“Must’ve been the newbie, I’ll tell him”