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To be overly excited, hyper, obnoxious, or completely insane.
Guy 2: Dude, calm down. You're being groot as hell.
by Lucubriousness February 25, 2009
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cute ass motherfucker that saved the guardians of the galaxy that one time and then turned into a cuter motherfucker after he died and danced to โ€œi want you backโ€ by the jackson 5
by harambewasalie August 11, 2016
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1. A term used to describe a man who has a deformed penis, not too dissimilar to a tree branch.

2. Also used in much th same way as twat as an offensive term.
1. Hahahaha, he has a groot

2. Some fukin groot has nicked me fuckin wheels
by spluh January 26, 2006
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to be swoll, buff, fit, athletic, and/or big. to attain muscle
"Dude you are looking groot today"
"You wanna hit the gym and get groot?"
by hyperassnigga123 August 13, 2015
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