Definitions

1. noun

A humorous or ironic image of a cat with a caption in a playful, deliberately misspelled style, often used to convey amusement or sarcasm.

“The internet is filled with adorable lolcats, each with their own funny caption.”

2. interjection

An expression of amusement or sarcasm, used to convey that something is silly or absurd.

“Oh wow, I lolcat-ed at the ridiculous video!”