A powerful GM big-block engine, capable of delivering 400+ HP, usually found in vintage full-sized cars.
ebon: Man, dat deuce wit a 455 whacked my 4!
engl: My 1964 Chevy lost a race to a Buick Electra with a 455cu.in. engine!
by daDebil February 21, 2004

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Top Definition
Leetspeak (13375p34|<) for the 3-letter word for "donkey" or your rear end in your nether region.
Someone deserves a good swift kick in the 455!

That 455 Cubic-Inch engine kicks 455 and the 454 outta the water!

And what the heck is an "ASA engine" anyway?
by Java February 11, 2005

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A powerful engine from oldmobile
I have a 455 olds in my boat
by vince April 01, 2005

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A form of automotive air conditioning for cheap cars - four windows down at fifty-five miles per hour. Ususally pronounced "four, fifty-five".
Damn it's hot in this Pinto - turn on the 455!
by cine0n November 27, 2004

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a buick motor that kicks the chevy 454 up and down the block
pussy 454 weighs more than a 426 hemi
by ch3n02 May 09, 2003

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References 2 different GM-produced motors. The pontiac version was good for keeping boats from moving around when attached to the end of a chain, while the Buick versions made 400+ hp and 500+ lb. ft. in stock form, or in modified form (like the one in MY pimp-455 ride) can produce in excess of 520 hp and 598 lb. ft. WOOT!
Ricer: Damn boy, thats a big-455 motor, how many liters is that?

Buick: Well, its 455 cubic inches, which is 7.6 liters for you dumb-45535 who can't convert to proper measurements
by BigDick February 29, 2004

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Just another GM motor that wishes it was a 427.
Man, I got a 455, but I'm thinkin of getting a Caddy 502, cause its bigger, and that means better, unlike that little 427 in that Vette that keeps blowin my doors off.
by fli gti December 09, 2004

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