(pronounced Hemit) M978 2500 gallon capacity fuel carrying truck.. HEMTT is an acromnym for Heavy Expanded Mobility Tactical Truck
"yo check out the sweet rims on that HEMTT"

or

"That HEMTT's haulin ass"

or

"Holy Shit look it's a HEMTT"

or

"The PFC drivin that HEMTT is sexy"
by PFC Greatness January 2, 2010
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when riding in the Army tactical vehicle known as the HEMTT (heavy expanded tactical truck) the occupant will receive an erection in less than 30 minutes of travel. This is usually caused by the vibration, bouncing and generally rough ride of the truck.
We had only been on the road for about 5 minutes before i got hemtt bone.
by explodie December 6, 2011
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