Like 69'ing but standing up, the partner holds their partner whilst performing fellatio. The carrying partner vigourasly shakes much like the emptying of a sandbag.
Last night we tried sandbagging, he emptied me everywhere and then I emptied him.
When someone drinks soda while others are drinking alcohol, pretending they are also drinking alcohol. They start drinking alcohol after the rest of the party is drunk and claim they can drink everyone else under the table....Sandbagger!!
Ex Dave T. drank coca-cola classic until 9pm, what a sandbagger.
In gaming, the act of slowly leveling while otherwise increasing stats and currency in order to be stronger than other players at your same level; who have not sandbagged. Particularly useful in pvp focused games that pair players based on level.