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