(Internet slang,humourous)Used to toutvictory over an opponent, or simply as a humorous catchphrase.
Etymology
Mistranslation of Japanese君達の基地は、全てCATSがいただいた(literally “we (CATS) have taken all of your bases”).
This grammatically incorrect "Engrish" phrase originated in the English subtitles to the 1991 European Sega Mega Drive version of the 1989 Japanese arcade game Zero Wing and became a catch phrase/meme on the Internet in the early 2000s.