Short for hemmeroid.
"Paul, it hurts so bad to sit down, I think my hemi's acting up!"
by Melissa January 20, 2004
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hemi iz me..dats my name 0.o
hemi hemika yeh dats my name in full
by Hemi August 17, 2004
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North american bred engine fueled by pure adrenaline.It likes to prey on the weak, the slow and the quiet such as F150s, Nissan Titans and Chevy Silverados. With a satanic grunt it's easily the most famous engine in the USA.
5.7L hemi, 6.1L hemi, 426 hemi
by Patrick S July 10, 2005
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The HEMI was the shape of the combustion chambers of some of the most powerful and successful Chrysler engines in the '70s, the most notable one being the 426. The shape was in use long before Chrysler came up with it; the earliest HEMIs can be found in engines built in the '20s.

Now, the HEMI is proof that brand name affinity sells cars, and that nothing in the automotive industry is sacred. The current design is a ripoff of a Porsche design. If you want to visualise what the current HEMI head looks like, take a pear, cut it in half lengthwise, and lie it down. The big circular section is where the intake valve is, and the small one is where the exhaust valve is. The TWO spark plugs reside at the "waist" of this pear-shape, one on each side. Note that there isn't two plugs for added performance, but rather because one plug off to the side couldn't hope to burn all of that fuel.
I park my Dodge Ram with the HEMI right next to my new Olds 4-4-2 minivan and Ford Escort Boss 429.

Damn, I wish someone told me that this HEMI crate engine weighed 5000lb and is only suitable for drag racing.
by BossMC April 9, 2005
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Someone that gives you what you want. Sexually.
Usually has high expectations yet will lower herself to the guy/girl's level.A fun person to hang out with.
I was out at a party one night and this chick was a hemis
by Steven louis November 16, 2007
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Ahhh the best motors ever raced. Used today used yesterday will always be used. Hemispherically combusted engine.
Anybody heard of Richard Petty? 1960's
426 Elephant Motor. 331 Firepower. HEMI 'Cuda HEMI Charger HEMI Superbird.
by Iron Man August 4, 2003
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Old Mopar engines used in Dodge/Chrysler cars such as Chargers, Super Bee's, Road Runners, Challengers, and other muscle cars. The name was derived for Hemispherical cylinder heads using a SOHC design. The new "Hemi's" are not actually Hemi's, but just a copyrighted name used to sell cars. New Hemi engines are simply a waste of fuel, space, and money. Dodge achives it's power these day by low-tech cheap in-efficient engines. With Chevy you get about the same performance with about double the MPG. Dodge talks about their new Viper-powered V-10 Ram, which is the fastest stock pickup in the world. Well last time I checked, people don't by pickups to go fast, they buy them for hauling shit.

Dodge Sucks.
I am quite positive if Chevy or Ford wanted to make the fastest stock truck in the world, they could, without using a super-car engine.
by Rice Hater August 8, 2005
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