bellywhacker
The act of diving/jumping into a pool, only to painfully hit the water stomach-first, often creating a loud crack noise and an even bigger splash. Somehow, every person present will notice if you do one.
"Ooh! That bellywhacker had to hurt!"
the messiah of bellywhackers
A phrase coined by Colin Lane in an episode of 'The Adventures of Lano and Woodley'. Used to describe the biggest bellywhacker imaginable.
"Oooh! It is the MESSIAH of bellywhackers!"