(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 01, 2010

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