This is when an older person goes for a younger person with a large age gap between the two and the older one would be the one accused of playing in the sand box. Which is where younger people such as children play.
This name, very deceiving, is not about two girls and one sandbox. Rather, it is about a girl shoving a popsicle down a someones penis, while he screams with pain. I would advice against watching this, it is very gross.
A sexual act similar to an Aligator Fuckhouse. It consist of one man sticking his erect penis into the anus of his victim, biting his neck and procedes to roll around, simulating an aligator's death roll. Just before the perpatrator ejaculates, he reaches around and chokes his victim violently, tightening the anal cavity, making his orgasm more pleasurable. Created in the deep south where father/son and father/daughter sex is acceptable.
Timmy: Wow y'all, I am so sore!
Chris: Why is that bro?
Timmy: My dad gave me a hardcore aligator sandboxlast night! Roughest yet!
*Chris calls police*
When you excrete explosive feces from your behind and some of the feces sticks to your butt cheeks and crusts over, therefore creating a sandbox from your rectum.