: This is generally considered one of the earliest uses, a screenshot of the Red Alert 2 beta (identifiable due to distinct pre-release graphics) tagged with the image macro, "I am in your base killing your d00ds". It's also notable for the sentence being grammatically and syntactically correct until the very last word, indicating its age even more - it had yet to be exposed to internet slang, corrupting it into the distinct "im in ur X, Ying ur Z" (im in ur base, killin ur d00dz) format. However, that image is from a blog and I know that's not a verifiable source, but the facts can be obtained from the image. Encyclopedia Dramatica also has an article on it (search "I_am_in_your_base_killing_your_d00ds" over on ED if you're that curious). Not Starcraft, not Counter-Strike, Red Alert 2. AFAIK.