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1.
A long, white cat that's popular throughout /b/tards and the /b/ board. Usually photoshopped into funny pictures.
longcat is LOOOOOOONG
Por BIG M-SLICE 16 de septiembre de 2006
 
2.
An exceptionally long white cat originating from 4chan's /b/. See also Tacgnol.

As a meme, has given birth to the phenomenon of doubling adjectives for variety or emphasis.

-Longcat is looooooong.

-John: What did you think of Gigli?
Sean: Bad movie is bad.

-I've been reading Einstein's papers, and boy. Smart man was smart.

-(during the end of Star Wars Episode 3)
Anakin: HOT LAVA IS HOT
Por T_Andrews 05 de octubre de 2007
 
3.
/b/ meme.
One day, there was a picture of a cat. It was not Caturday but this specific cat was so long it became a meme and, though the day was not specifically the day of cats, this cat's length became famous.

Many new lusers speculate that this cat is not lengthy, but it is in fact long.
Long cat is looooooooooooooooooong.
Por Koori 22 de septiembre de 2006
 
4.
Noun: a cat that is long, or, more notably, a white female cat holden by two hoomin hands that is so long that if she fought Tacgnol, the world would end.

Verb: to use an adjective twice in the same sentence.
Longcat is long!

Shortcat is short!

Dumbass is dumb!

Groundskeeper Willy is a groundskeeper!
Por Fosterpython 08 de enero de 2009
 
5.
a fur matted vagina that is as long as it is wide (gapingwise)
“I lost my can of soda after throwing it at that cooze's longcat”
Por ghandithong 24 de febrero de 2010
 
6.
Holds no sway of the power of wide dog.
Longcat is LONG

Widedog is WIDE.
Por Ookami Raito 27 de febrero de 2008