nouninformal Australian, New Zealand
1A newly arrived immigrant; a new arrival to an area. Now chiefly historical.
2A novice, newcomer, or beginner; a person inexperienced in a particular occupation, activity, etc.
adjectiveinformal Australian, New Zealand
That is a newly arrived immigrant, novice, etc. Also: characteristic of such a person; raw, inexperienced, unsophisticated, amateurish.
Early 19th century (in an earlier sense). From new + chum.