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.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)