Definition of boom boom in English:

boom boom

British informal An exclamation made after delivering the punchline of a joke.
[popularized by the fox puppet Basil Brush, a character in a British television comedy show]
More example sentences
  • I've answered this question in some election hustings by saying I'd be the fish that swims against the tide… boom boom.
  • As Basil Brush used to say, ‘boom boom’!
  • Unfortunately, I have a conscience (although the band seem to have taken a day off for theirs - boom boom!).
See parent entry: boom

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