From LOLCat Bible Translation Project
Basement Cat is the enemy of Ceiling Cat, who is the Lolcat equivalent of God (AKA. Jesus, Christ, etc.). It still remains a mystery exactly what Basement cat is, although he is usually depicted as a small, black kitten living in a basement. Most lolz ascociated with Basement Cat depict him as 'evil,' and he has become widely known as the 'devil' (AKA. Satan, Lucifer, Prince of Darkness, etc.) of Lolcat mythology.