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Wikipedia

Lolcat

A lolcat (pronounced ) is an image macro of one or more cats. The image's text is often idiosyncratic and grammatically incorrect. Its use in this way is known as "lolspeak" or "kitty pidgin".

"Lolcat" is a compound word of the acronymic abbreviation for "laugh out loud" ( LOL) and the word "cat". A synonym for "lolcat" is cat macro, since the images are a type of image macro. Lolcats are commonly designed for photo sharing imageboards and other Internet forums.

Wiktionary

lolcat

n. 1 (context Internet neologism English) An image macro of, usually, a kitten or a cat with a humorous caption. 2 (context uncountable Internet neologism English) The deliberately misspelled and grammatically quirky form of English associated with such images' captions.