The process of bringing your own sand to a beach themed party (in particular mall beach parties), and is almost always required as the hosts seldom provide any sand. It is often abbreviated BYOSand or BYOS on invitations.
by Anonymous09429852 November 23, 2010
Taking your girlfriend / boyfriend to a party or social event where there will be plenty of single women / men to mingle with.
Damn, can you believe that Colin is actually bringing his own sand to the beach tonight! Doesn’t he know that Anna's parties are crawling with beautiful single models!!!
by BigCee August 19, 2005