Top Definition
An abbreviation for "Umm but yeah" - usually used to deter from a topic and bring up something completely irrelevant to what you were previously speaking about.

It is a method of abbreviated conversation evasion - created by Jordan and Carmen :D
Guy: "Yeah, I really like parties where you get drunk"
Girl: "UBY this 3d apple looks like you"
by downfall222 November 24, 2010
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