V. the action of dipping one's meatstick in the sand while boning your girl/victim while they are on their back and then proceeding to stick it in the vagina thus giving her a painful orgasm
Yo I just railed this crazy bitch on dabeach and she screamed when I gave her the Sandy Surprise!
It's when you shave your ass and around your asshole, then wait a couple of days for some stubble to grow. Then you take a shit on someones chest and rub it in with your ass hair.