Sand box say when a female is giving oral to a guy then he is fingering her ( not eatting her ). when you lay down in the sand it feels good when your penis is in the wet sand ( her mouth ) then your fingers are playing in the sand ( her vagina) its not the 69 it's the sand box.
did you and her do anything last night ? yeah i sand boxed her !
When one is having relations of the sexual nature on the beach. The man upon nearly cuming (perferably after a substantial time after the comencing of intercorse). withdraws from the female luv hole (aka box) and finishes himself off, squirting his sticky man juice all over the girls box. then with the opposite hand grabs a handfull of sand and chucks it at the girls box causing it to stick. Hence the name sand box (not to be confused with the common childhood play area)
