(US, colloquial, often preceded by hey) Used to express surprise or dissatisfaction with an action or statement of another person, especially to that person.

Events that have already taken place cannot be changed and actions that have already been committed cannot be undone, so it is best not to dwell on them.

Alternative form of what's-his-name

Alternative form of what's up Doc

Alternative form of what's up Doc

(colloquial, humorous) What's up?

Alternative form of what's up Doc

(dated) Synonym of know what is what

(informal) Synonym of what's your poison

Alternative form of whatsitsname.