Green’s Dictionary of Slang

blue n.4

[abbr. bloomer n.2 ]
[1920s+] (Aus./N.Z.)

1. a blunder, a mistake.

2. a brawl, a quarrel.

3. a serious complaint, an objection.

4. a problem.

In phrases

bung on a blue (v.) (also put on a blue, stack on a blue) [bung v.1 (3)]

[1950s+] (Aus.) to make a fuss, to create a disturbance.

put a blue on (v.)

[1950s+] to make a fuss, to raise an issue.

send off the blue (v.)

[1970s+] (N.Z.) to start a fight.

smack a blue (v.)

[1930s+] (Aus.) to get into trouble.

wear the blue (v.)

[1990s+] to take the blame, to suffer punishment.