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Blooper

//ˈbluː.pə// noun, slang

Noun

1
A blunder, an error. informal
"Why do my readers and informants so delight in bloopers and boo-boos, fluffs and flubs, and goofs and gaffes? […] The humor in bloopers lies, in part, in the listener's awareness of the speaker's vulnerability. It is the very artlessness of linguistic lapses that makes them so endearing and makes us feel superior."
2
an embarrassing mistake wordnet
3
A fly ball that is weakly hit just over the infielders. slang
"Again the blooper wafted up to the plate. Ted waited and waited and then let loose. The ball rose in a high trajectory and sailed deep into the bullpen for a homer. The fans roared. The slugger had killed the blooper."
4
A filmed or videotaped outtake that has recorded an amusing accident or mistake. informal
"WLK. First radio station. On December 31, 1921, local engineer Francis F. Hamilton's radio station, 9ZJ, signed on with an address from Mayor Samuel (Lew) Shank. Broadcasting from Hamilton's garage at 2011 North Alabama Street, Shank made the city's first radio blooper: "Hamilton, do you mean to tell me that people can actually hear me over that damn' dingus?""
5
A gaff-rigged fore-and-aft sail set from and aft of the aftmost mast of a square-rigged ship; a spanker.
"Once the blooper is around the spinnaker, let out the blooper sheet completely (which collapses the blooper), race the blooper sheet forward and reset on the other side."

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6
A radio which interferes with other radios, causing them to bloop (squeal loudly). US, dated
"Upon close tickler coupling, the detector tube will oscillate, in which condition the tuning of DX will be faciliated. At such times the amount of energy radiated from the antenna is negligible, and does not interfere with reception or neighboring devices. This Roberts set is, therefore, not a "blooper.""
7
The Vietnam-era M79 grenade launcher (due to its distinctive report). US, slang

From bloop + -er, of US origin.

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