Green’s Dictionary of Slang

mungo n.3

[? SE mungo, a tough material, made from recycled rags, ? used for old rugby shirts]

1. (Aus.) Rugby League, its players, officials and fans.

S. Poidevin For Love Not Money 79: The management thought the two codes were similar and took some convincing that we’d behave ourselves better than the Mungos [GAW4].
Workers Online 5 Mar. 🌐 [headline] Mungoes Death Throes Won’t Be Pretty [...] Rugby League is fast disappearing up its own orifice and the last rites will become increasingly unsavoury.
Urban Dict. 18 Aug. 🌐 Mungo Anyone involved with Rugby League be it fans, players, coaches, administrators, reporters etc.
[Aus]Betoota-isms 141: Mungo [...] 1. Rugby League.

2. attrib. use of sense 1.

A. Slack in Australian 10 May 22: The rugby players ... are annoyed at being constantly referred to by our mungo mates as those rah-rah tweed coat types [GAW4].
[Aus]Sydney Morning Herald 5 June 🌐 According to one witness, ‘semi-jocular accusations turned into rude comments’, although fortunately the Governor General of Australia, Sir William Deane – in another ARU box some distance away – did not hear the ‘mungo talk’.