Definition of whataboutism in US English:

whataboutism

noun

British
  • The technique or practice of responding to an accusation or difficult question by making a counteraccusation or raising a different issue.

    ‘the parliamentary hearing appeared to be an exercise in whataboutism’
    Also called whataboutery

Origin

1990s: from the way in which counteraccusations may take the form of questions introduced by ‘What about —?’.

Pronunciation

whataboutism

/ˌ(h)wədəˈboudizəm//ˌ(h)wədəˈbaʊdɪzəm/