A television programme/program or movie presented as if it were a documentary but that is not factual and often a parody or satire.(noun)
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Use "mockumentary" in a sentence
"A fresh, ironic take on the insanity of suicide bombing but also the reality of a fractured society and the frustration of disconnected people ... in mockumentary format."
"In fact, I think a Tap-style mockumentary is in order for the Neocons."
"Bestseller sales for the past week saw the (unsurprising) debut of Jon Stewart's new "mockumentary" - style look at the planet and the human species."