Green’s Dictionary of Slang

cowyard n.

[cow n.1 (2) + pun on SE]

[late 19C–1910s] (US) a cheap brothel.

SE in slang uses

In compounds

cowyard cake (n.) [it is supposedly reminiscent of a cowpat + attendant flies]

[1920s–50s] (Aus.) a type of cake or bun that contains sultanas.

cowyard confetti (n.) [euph. for bullshit n. (1)]

[1940s+] (Aus.) nonsense, rubbish.