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1.
A reference to a video on the internet in which a woman viciously rams a dildo into a man's penis as you hear his screaming in agony.
I pissed blood for a month after she pulled the "kids in a sandbox" on me!
av poopmaster5000 2 november 2006
 
2.
Kinds in a Sandbox is a disgusting video in which a woman shoves a vibrator into the urethra of a man
Kids in a Sandbox is a nasty form of female domination
av Shahnawaz 15 november 2007
 
3.
Probably one of the most misleading sites on the web. The video is around 10 seconds long. It starts out like a regular porn video, a girl and a guy are in a 69 position having sex. All of a sudden the girl sticks out some sort of plastic dildo and constantly jams it in the guy's cum hole. Moaning ensues, and the penis nearly splits open. It's a loop video.
Me: Hey, Nick, watch kids in a sandbox *Gives link*

Nick: Uh is that kids playing in a sandbox?

Me: Yeah... just click the link

Nick: *Clicks* Hey this is a porn si- WHAT THE FUCK!
av Some Twink 23 april 2011