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19.
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 08, 2005
 
1.
A semi erect penis which occurs as a result of sexual arousal from looking at another man.
“The locker room shower was a tough place for him to hide his hemi.”
by Howard Wakefield September 28, 2007
 
2.
Term used by those in the gay community to describe a, supposed, heterosexual man's erection provoked by homo-erotic thoughts, situations or other stimuli.
"He says he's as straight as a die but his hemi showed through his pants a mile away."
by Silas Flannery December 03, 2007
 
3.
A nice engine but is not what it used to be.
Yeah man, that Hemi tore some shit, but then i bought a LT1 and now im twice as fast
by hutch November 02, 2003
 
4.
A semi erect penis which occurs as a result of sexual arousal from looking at another man.
The locker room shower was a tough place for him to hide his hemi.
by Howard Wakefield October 04, 2007
 
5.
A guy in the closet's erection from looking at another guy.
All the men hid their hemis when I strode into the room.
by Brian Teemes January 15, 2008
 
6.
Nickname for a powerful Chrysler V8 engine from the 1960s that had a hemispherical combustion chamber. The name has since been trademarked by Chrylser and applied to a new, 345 horsepower V8 that does not have the characteristic hemispherical heads. The new engine is not really a hemi; DaimlerBenz, the owners of Chrysler and Dodge, wanted a name that would convey the power of the new engine so they picked Hemi.

The copyrighted term Hemi and the accompanying engine have been marketed with a series of commercials featuring actor Jon Reep.
Q: That thing got a Hemi in it?
A: Well, if you mean, does it have the new, 345 horsepower Chrysler V8, then yes. But if you mean, does it have the legendary Mopar V8 characterized by hemispherical combustion chambers, then no, this thing does not have a Hemi in it.
by zodar June 20, 2004
 
7.
An abbreviation for the medical term hemroid.
That thing got a hemi?

Nope, but I sure as hell do!
by bobbeh. August 12, 2005