This is how the English say when some attempt (usually a joke, speech, campaign...) fails. In Finnish siitä tuli pannukakku (became a pancake) or se lässähti (fell flat; descriptive word). The latter can also be used to describe atmosphere.
In Italian, I suppose, there's no reference to pancakes. They say that something è andato a monte (went to the mountains) or ~ in fumo (smoke).
Does your language have links to flat things (or even mountains)? Thank you!
In Russian, people seem to shout блин! if something goes wrong. Is this true?
They say det blev bara pannkaka av alltihop in Swedish, too.