look up any word, like blumpkin:
 
1.
Term used to describe a popular video on the internet where a guy sticks a dildo up his penis.
"My neighbor was performing 'Kids in Sandbox' on himself!
by Dan-Man2 August 20, 2005
 
2.
An act at which a women penetrates a dildo inside a men's penis whole.
My penis hurts cause i got kids in sand box.
by breno soares January 07, 2008