blooper

Short definition from Wiktionary

Noun

1. 1
   A blunder, an error.
2. 2
   A fly ball that is weakly hit just over the infielders.
3. 3
   A filmed or videotaped outtake that has recorded an amusing accident or mistake.
4. 4
   A gaff-rigged fore-and-aft sail set from and aft of the aftmost mast of a square-rigged ship; a spanker.
5. 5
   A radio which interferes with other radios, causing them to bloop (squeal loudly).
6. 6
   The Vietnam-era M79 grenade launcher (due to its distinctive report).