Green’s Dictionary of Slang

1. a shower of rain.

1999		G. Seal Lingo 91: fairy bower is a shower.
2002		Pete’s Aussie Sl. Home Page 🌐 fairy bower: a shower.

2. a shower for washing.

1952		Argus (Melbourne) 13 June 4s/1: If the squatter’s daughter’s cast iron pot, I’ll have a fairy bower, but if it’s soldier’s bold I’ll have a lemon squash.
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Fairy bower. Rhyming slang for shower.

3. an hour.

1983

R. Aven-Bray Ridgey-Didge Oz Jack Lang 7: She had been posted on the possie for over a fairy bower and had not cracked it.