Greasy War Pig Share definition Flag A heavyset girl; usually unattractive, but good enough to sleep with if one is sufficiently impaired.See also GWP or G dub P. Where are all the hotties at? I guess I'm gonna have to hunt down a greasy war pig tonight. Greasy War Pig by davemcnasty July 10, 2011 Get the Greasy War Pig mug.