Definition of boomer in English:

boomer

Pronunciation /ˈbo͞omər/ /ˈbumər/

noun

  • 1North American informal

    short for baby boomer

    • ‘the younger generation have to live with the effects longer than the boomers do’
    • ‘the cultural references might have made sense to boomer audiences in the early 80s’
  • 2informal Something large or notable of its kind.

    1. 2.1Australian A large male kangaroo.
      • ‘I didn't see the old boomer 'roo who startled me (as I startled him) on Bare Bluff earlier this week at dawn.’
      • ‘No, male kangaroos (boomers) don't have pouches. Only females do.’
      • ‘There's not much in the Australian outback that can give a fully grown 'boomer' a hard time.’
    2. 2.2A large wave.
      wave, breaker, roller, comber, billow
  • 3US informal A nuclear submarine with ballistic missiles.

  • 4US informal A transient construction worker, especially a bridge builder.

  • 5US informal

    another name for mountain beaver

    • ‘I didn't see the old boomer 'roo who startled me (as I startled him) on Bare Bluff earlier this week at dawn.’
    • ‘No, male kangaroos (boomers) don't have pouches. Only females do.’
    • ‘There's not much in the Australian outback that can give a fully grown 'boomer' a hard time.’

Origin

Early 19th century probably from the verb boom+ -er.