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(emoticon) way to express that something is cute or funny, but emphasized.
Boy: I love you, baby.
Girl: x33 I love you too.
by Rocket111 October 09, 2006
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The X-33 was a technology demonstrator for NASA's "next-generation" of space launch vehicles.
Ya know, they say CERN has the only X-33 rocket
by Sasakura May 14, 2005
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