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A grounder is when a bunch of kids or adults play a stupid game at a playground where one person is 'it' and has to find the others while blindfolded. If you're caught moving on the ground, you get it and everyone laughs at you like you're a idiot.
I got it because I tripped on a slide while trying to sneak away.
My cousin got it because he ran into a swing and fell flat on his face.
I got it because I tried to hide behind a jungle gym and got caught by the stupidest person ever.