Green’s Dictionary of Slang

rep adj.

[SE reputed, reputable]

(Aus.) well-respected.

[Aus]Bulletin (Sydney) 11 Dec. 30/3: For amongst the second batch is one Jack Chandler, ‘gun’ shearer and dare-devil, whom I used to know over in the East. He is ‘rep’ at Dead Dog Downs, and [...] enthusiastically introduced me all round.