Doolally (adj/n): Eccentric, mad, unhinged, insane. A shortened form of doolally tap, referring to a transit camp in India during the the days of the British Raj, from 1858-1947. Deolali housed time-expired British soldiers waiting for passage home, and the boredom is said to have driven some soldiers into odd behaviour. Tap connotes a fever. So the long phrase means something like “cabin fever.” I love this word. Used in the short form, as is common today, it becomes a noun. The line manager at the M&M’s factory went doolally when she found out an employee had been rejecting all the W&W’s.