Top Definition
Acronym for the term "grown up but not". Used to refer to doing something adult at the same time as something your 10-year old self would have done. Also used when you are doing something kid-like in an attempt to avoid adult responsibilities. Or when you're technically an adult but really have no idea what you're doing.
Eating cocoa puffs and drinking wine. GUBN
Just ironing my shirt with my hair straightener, no big deal. GUBN
Paying my taxes with disney checks. GUBN
by Jaynie8884 May 04, 2013
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