Definition of "docu"

Yesterday I saw a docu about a dingo that carried off this couple's baby while they were having a picnic.

2002, Peter Makuck, Costly habits: stories

[…] the docu centers on the latter’s [a courageous female adolescent] creation of a Gay-Straight Alliance in a Utah high school that became a hot political issue in 1996.

2006 February 22, Emanuel Levy, “Out of the Past (1998): Jeff Dupre’s Docu about Knowledge of History and Self”, in EmanuelLevy [personal website]‎, retrieved 2021-11-16