This is the little-known twin brother of "Go Fuck Yourself." However, the demand is slightly more humiliating and degrading -- as the prospect of getting fucked by some unknown force in an unknown orifice is much more unsettling than merely fucking yourself, or masturbating.
Can be shortened to GGF for brevity.
Steve: Blake told me you had sex with my sister last night.
Buck: Yeah, well you can tell Blake to go get fucked.