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Slang term, means someone needs to change their behavior as they are acting childish.
by RogueUser May 23, 2020
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Jun 24 Word of the Day
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'

Susan: 'LEAVE BRITNEY ALONE!'
by Billy Chickenhole September 15, 2007
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2
Something you would say to most users in Urban Dictionary
Most definitions posted by users on UD are dirty, sexy, pervy. Grow up
by Suklaa November 10, 2019
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3
A phrase parents use against there children, who were a lot more fabulous and fun than they were
*Carlie comes home 2 minutes past curfew*
-"How unacceptable, grow up"
by RihannaNavy23 May 13, 2016
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4
That thing you've got a whole lot of to do.
Me: grow up
You: πŸ™„
by LiberalDestroyer007 November 16, 2018
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5
Grow up is phrase said to people who are acting like a bit of a chump and need to act their bloomin' age.
"Ha, ha! Look at me - "

"Grow up! You juvenile bastard!"
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