mockumentarymock‧u‧men‧ta‧ry /ˌmɒkjʊˈmentəri $ ˌmɑːk-/ noun (plural mockumentaries) [countable] 
a funny film or television programme that pretends to show real people and events, although in fact they are not real: 
a mockumentary about a fictional rock band
a funny film or television programme that pretends to show real people and events, although in fact they are not real: a mockumentary about a fictional rock band