Top Definition
U.S. Marine Corps nickname for the Drill Instructor at one of the two Marine Corps Recruit Depots assigned to a platoon of recruits and in charge of discipline. Sometimes combined with the Heavy Hat who is in charge of instructing drill.
"I was falling asleep in class when my Kill Hat caught me. I spent the next 30 minutes in the sand pit..."
by Pylon0311 October 01, 2012
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