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rat house

Australian slang for a psychiatric hospital or mental institution.

ˈɹæt ˈhaʊs121 viewsLast reviewed Jun 29, 2026+ Add a definition
🇦🇺 Australian & NZ slang
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Australia
#1·Apr 28, 2026AUS

Australian slang for a psychiatric hospital or mental institution. A blunt, derogatory term that reflects older stigmatising attitudes toward mental illness. Now considered offensive and outdated in contemporary usage, but still appears in historical texts and older Australian vernacular.

His mates joked that he had finally lost the plot and was headed for the rat house.
Origin: From rat in the sense of a crazy or erratic person (as in to smell a rat or ratty), plus house. Editorial expansion authored on Slangora (model-assisted, hedged).
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Australia
#2·Apr 27, 2026AUS

(AU, slang) A mental hospital.

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Aussie and Kiwi vocabulary — bogan, daggy, brekkie, sheila, bach, jandals — the whole Antipodean lexicon, including outback dialect, surf and beach culture, and Sydney/Melbourne street slang.

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