GI

1. adjective

Given to a soldier by the army (as an item), rather than brought from home; or used by the army (as a procedure), and different from its civilian counterpart.

Soldiers counted cadence by chanting: “GI brush / And GI comb / Gee, I wish that I was home!”

2. noun

a) A member of the U.S. military.

b) One who is demanding and strict, in the manner of a stereotypical member of the military.

3. verb

To clean aggressively.

Top, get the unit to GI this AO before the old man arrives.