Wing It is a computer program advertised in Grand Theft Auto IV.
The program was first created by Facade in 1997, according to the radio advertisement. The term "wing it" is an idiom meaning to improvise, suggesting that many computer-made presentations are created on the fly. The manufacturing company, Facade, is also part of the joke.
The Further Adventures in Finance and Felony update for Grand Theft Auto Online features an addition of executive offices, with the assistants' computers running a WingIt text processor with an interface similar to that of Microsoft Office 2013.