Sandboxing refers to the action of having sex on the beach with a girl and immediately after blowing your load scooping a handful of sand and throwing it into her vag
Jack: oh I'm coming! (Grabs handful of sand and hurls it at jills vagina) you are a victim of sandboxing!

Jill: ew! Gross Jack!
by Marine9728 July 19, 2013
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When your cat plays in his litter box long after he's done with his business.
What is taking Muffin so long?

She's sandboxing, dear.
by mcjam69 November 24, 2015
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Often a result from a long day at the beach, a sandbox results from an excessive amount of sand in the box. Other causes may be from mud restling or as a result of a hot new trend. In Europe, women often throw sand in their box in the case of a hot sexual encounter. One can often tell when a girl has a sandbox because when she walks it makes a crunching/grinding sound.
Germaine: "Last night ah tried to hit up that box, cept that it turned out to be a sandbox!"
Dellareese: "Awww shit nigga!"
Germaine: "Ahh don't want no sand in m'a tacos!"
by CockBlocker February 2, 2006
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n. or adj.

childish behavior of an older person, aka someone acting like a five year old cunt when they are actually not
She was being a huge sandbox when she dropped her ice cream and threw a fit.
by anamses February 23, 2008
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what we should trun into a sheet of glass...
by Bill May 20, 2004
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