(1) Reference to a female member of the U.S. Armed Forces
(2) Nickname for a girl who's really into the military, very gung-ho or athletic, strong and aggressive; breaks into a traditionally all-male occupation or hobby.
(3) Name of a 1997 film featuring Demi Moore who plays a female Naval officer that successfully makes it through Navy SEAL training.
"Ever since she started with that corporate boot camp program, she thinks she's GI Jane."
A closeted bi or gay person who hides behind a straight marriage, but has gay encounters or gay lovers on the side. Usually gets caught and/or outed. Especially applies to people in the spotlight (politicians, movie stars, sports figures). Based on outed closeted NJ Governor Jim McGreevey.
You'd wouldn't believe how many conservative republicans are living the mcgreevey lifestyle.