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1. GBU
Short for God Bless You.
Bob: I just crapped myself.
Billy: GBU.
2. GBU
George Burns Unit: a Unit of Time comprising 100 years, named for the actor and Vaudeville comic George Burns, who attained 1 'GBU'. Additional or lesser time can be represented as a fraction of 1 GBU.
"It's been just over 1 GBU since the Titanic sank."
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