Literally stands for "Ground Infantryman", but many apply the acronym to the US Army soldier in general, whether they are in the infantry or not.
PVT Snuffy was an outstanding GI.
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Me: You're hawt. Wanna go to a movie?
Her: GIS Sure. :)
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Gi-Gi Nuff-Nuff is a term used when you want someone to shut the fuck up.
Jerry: "God, i just love her hair today"
Bertha: "You know what Jerry, just GI-Gi Nuff-Nuff.
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offensive.
A person who repeatedly loses ju jitsu/ judo fights by doing stupid things. (often used as a general term of abuse).
person A: i cant believe i gave him a straight arm again!
person B: i know your such a Gi-Tard. *Armbars person A*