head

U.S. Marine Corps- any restroom, bathroom, latrine, commode, place for bodily excretion on a Marine Corps base or simply referred to by a marine. Sometimes includes showers.
Origin: needs clarification

Gunnery Sergeant got pissed off during the locker inspection, so he hulled a full footlocker into the head and emptied it into a commode.

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head call

U.S. Marine Corps- to relieve oneself of urine and or feces in a designated location such as the head (restroom)

-Good morning sir. This recruit requests to permission to speak to the Drill Instructor. This recruit would like to request permission to make a head call.
-Frickin darn head call?! Now?! Are you getting ready to soil yourself?

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