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1.
British Slang - noun:

A work social or party with your co-workers arranged at a venue or just the pub or even within the office/workplace.

Usually arranged by someone at work.
1) The christmas work do

2) "Sick and tired of the same old work do's?"

3) Ben: Are you going to the work do this weekend?"

Josh: "Nah, I gotta date with this girl instead"
by Hydramus December 03, 2011