the act of hooking up with a random girl on a beach and cumming inside of her without a condom on.  The girl, now having cum inside of her, will waddle down to the water (not wanting to jar the cum any further inside of her) to wash herself out, looking like a sand crab.  The guy can then a) stay and laugh at the sand crab or b) get the fuck out of Dodge.
Ryan was at a beach party on Saturday and hooked up with a girl.  After he was done, he watched his freshly made sand crab for a couple minutes before running home.
by Jamie Sloughgart September 29, 2006
 Get the sand crabmug.
Get the sand crabmug. A basketball word made up by LeBron James, in which you can basically take a third step toward the hoop. also known as a travel.
by graveyard23 January 5, 2009
 Get the Crab Dribblemug.
Get the Crab Dribblemug. by Foxeswrestler24 November 1, 2010
 Get the Ass Crabsmug.
Get the Ass Crabsmug. a girl who fucked lots of guys and her crotch is now loose and crusty like form with lots of diseases in her crotch
by African-Ox January 12, 2011
 Get the crusty crabmug.
Get the crusty crabmug. by lloyd April 28, 2004
 Get the crab sandwichmug.
Get the crab sandwichmug. When a man ejaculates in a ziploc bag and shaves his pubic hair off while he has crabs. He put the pubic hairs in the bag and squezee the air out but not let the sperm come out. Throw the bag at someone and let it explode on thier window or face.
by SpenceDaddy January 30, 2008
 Get the Crab Bombmug.
Get the Crab Bombmug. by Derek61718 May 27, 2006
 Get the crab sandwichmug.
Get the crab sandwichmug.