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1.
when you are having sex on the beach and the guy throws sand in the girls vagina and continues on having sex
laura just got the worst sandy crab from frickie last night at the beach
by jeneatmyass September 11, 2006
 
2.
Throwing sand into your lover's private parts.
At Revere beach, Dan gave Jen an epic sandy crab. She couldn't clean it out for over a week.
by Sneaky Fox April 22, 2008