In the Marines, a "Jody" is a generalized term meaning: any man who stays home while everyone else goes to war. He gets to enjoy all the things the Marines are missing, more specifically the Marine's girlfriend back at home while the Marine is away on active duty. The reason that they're called Jody specifically dates back to black soldiers in WWII. They took a character from old blues songs named Joe the Grinder (or Joe D. Grinder) who would steal the ladies of inmates and soldiers, and clipped his name to Jody.

That's why they say, "Jody's back home, fucking your girlfriend."

The hypothetical man (often a sinister character who decided not to go to boot camp) that is doing your girlfriend/wife while you are on deployment overseas.

Ain't no use in goin home, Jody's got your girl and gone. Ain't no use in goin back, Jody's got your Cadillac, Ain't no use in feeling blue, Jody's took your checkbook too.

Term in the military for the guy at home fucking your wife / girlfriend while you're deployed. Can also mean a broke dick soldier unfit for deployment who stays back and fucks your wife while you're away. Because Jody is referred to in marching & running candences it's also slang for a candence, which are sometimes called "Jody Calls". That use would be used in plural like "sing us some jodys". The point of Jody in cadences is to compare how hard the soldier's life is vs. how easy Jody has it. Sometimes also mispelled Jodie.

You had a good home but you left / You're right You had a good home but you left / You're right Jody was there when you left / You're right Your baby was there when you left / You're right Sound off! / 1,2 Sound off! / 3,4 Cadence count! / 1,2,3,4,1,2...3,4!

Jody is refers to a man (often another soldier)who sleeps with other military men's wives/girlfriends while they are gone (deployed, TDY, etc). The term "Jody" comes from the song "Jody's got your girl and gone" by Johnnie Taylor. Every guy I know Trying to get ahead Working two jobs Til you're almost dead (You tell em) Work your fingers Right down to the bone There's a cat named Jody Sneaking around in your home There's a cat named Jody In every town Spending lots of cash And just riding around Ride on, Jody Ride on, ride on With your bad self Jody The ashes in your ashtray Footprints on your carpet While you work all day He even got the nerve To sleep in your bed Sit down at the table Eat your bread When you get home After working hard all day Jody's got your girl And he don't play I said Ain't no sense in going home Jody's got your girl and gone (It ain't no sense in going home) (You gotta get home but You work too hard) (It ain't no sense in going home) (You gotta get home but You work too hard) Ain't no sense in going home Jody's got your girl and gone) I tell you, Jody's got Your girl and gone (Ain't no sense in going home) When you discover Your gross neglect Itll be too late to Give your woman respect You'll hunt down Jody ? Ten thousand dollar reward For Jody's hide Ain't no sense in going home Jody's got your girl and gone