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A recipe that is not adequate to make a cake. Using a messy recipe could result in a 'crazy cake'.

This could be a term to describe 'creampie' in a child friendly manner.

Taken from 'the cake song' in the kids TV show 'Lazy Town'.
"You shouldn't use a messy recipe, your cake will end up crazy"

"I would go down on her, but that horse she just shagged has left a bit of a messy recipe'.
by mojorising October 02, 2006