I vote Leopardenfrühstücksgesicht = leopard’s breakfast face[1].
You need the element of eating in the word, since Leopardengesicht would just be a leopard’s face. And Frühstück is an inherently funnier word than the other mealtimes, in my opinion (cf. also Du hast wohl 'nen Clown gefrühstückt). ↩︎