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A lanky, barely passable version of a soldier who thinks a rifle is just a fancy stick and thinks bullets are just tiny pebbles. Also used for a meathead who still believes he’s the quarterback of the whole school.
My gym teacher is a G. I. Jimbo who still thinks he’s in the military and brings a Nerf gun to every drill.
My cousin tried to join the army and failed because he thought a grenade was just a loud balloon.
That guy at the mall who tried to do a push-up and fell over is a G. I. Jimbo.