(slang) An ambulance used to take a mental patient away to an institution.

(informal, derogatory) a member of the loony left

(informal, of a person) Insane. / (informal, of a thing) Very silly, absurd.

(informal) An insane or very foolish person.

Alternative spelling of loony

Alternative spelling of loony

(slang) A lunatic asylum.

(Canada, informal, numismatics) The Canadian dollar coin in common circulation since 1987. / (Canada, informal, by extension) The dollar as the Canadian unit of currency.

plural of loonie / plural of loony

A surname from Irish.