From Longman Dictionary of Contemporary Englishmadhousemad‧house /ˈmædhaʊs/ noun [countable usually singular] 1 BUSY PLACEa place with a lot of people, noise, and activity It’s like a madhouse in here.2 MP old use a psychiatric hospital
Examples from the Corpus
madhouse• The police station is a madhouse most of the time.• It's like a madhouse in there.• The house was like a madhouse.• Hackney has always been a resort for madhouses and mad people.• Imagine you're at home and you're not going back to that madhouse.• On account of the bust they can put me back in the madhouse for life.• It is easy to understand why he is in the madhouse. 