A joke that makes sense, but isn't funny enough so that normal people will laugh at it. The term comes from the Family Guy episode "Ocean's Three and a Half" where Two and a Half Men is being filmed in front of a live ostrich.
Man 1:"Have you ever seen Two and a Half men? It's hilarious."
Man 2:"What the hell is wrong with you, that show isn't funny at all. Every joke is an ostrich joke."
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