Contraction of when is. / (informal) Contraction of when has. / (informal) Contraction of when does. / (colloquial) Contraction of when was.

At the time of an event, contingent on that event happening at all.

(UK) as soon as

(colloquial, rhetorical question, sarcastic) From what time. / (colloquial, rhetorical question, sarcastic) (as an interrogative interjection) Used to indicate doubt as to the veracity of a statement.

(idiomatic, Britain) (of a person) in reality; in fact; when it comes down to it. / (idiomatic, Britain) (of a topic) plainly; in plain English; at its most basic level.

(idiomatic, by ellipsis) Adjust to local customs.

(idiomatic) An imperative form used to request that the interlocutor indicate when one should stop doing something, esp. pouring a drink, because one has reached a sufficient amount.

Alternative form of way back when

Alternative form of way back when

(idiomatic) as for; with regard to (phrase used to introduce a new topic)