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I more extreme version of cba but lesser of cucba its a acroynm for ultra cant be assed. used by youths being lazy
matey 1: oi geezer fancy going out gettin steaaming init
matey 2: na mush ucba
matey 1:lazy cunt!
matey 2:go die you heeb!
by Chode McA May 12, 2008
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