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An initialism for "all your base are belong to us," a humorous admission of victory. The phrase comes from a poor Japanese-to-English translation in the 1992 video game Zero Wing, which was then used as an Internet meme from the early 2000s. Ha-ha, we win again! AYBABTU!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.