Cupcake Slam is a game played Carly, Sam, and Freddie, in the episode iGive Away a Car. In the game, the players have to throw one cupcake each at a door or wall. The thrower of the first cupcake to fall off of the wall or door loses. Sam lost the Cupcake Slam in the episode, and had to drink pickle juice as a penalty, which she actually enjoyed. She even came back downstairs later to finish off what was left.
The game starts off with unfrosted normal cupcakes. You supposedly then proceed to take said cupcake and put it in a dish full of frosting to use as a glue to help them stick to the wall. In the game the three held, Carly's chose the pink cupcake (strawberry), Freddie chose the yellow cupcake (vanilla), and Sam chose the brown cupcake (chocolate).
Carly (Miranda Cosgrove) surrounded by many delicious looking cupcakes