Definition of OMG in English:

OMG

exclamation

informal
  • Used to express surprise, excitement, disbelief, etc.

    ‘OMG! If my parents find out they will go mad!’
    • ‘Omg, we finally did it!’
    • ‘omg, that girl in today's episode was a complete maniac!’
    • ‘I read that entire forum thread, and omg, what a bunch of tools the regular posters are - the board admin is the worst.’
    • ‘Omg, that was fun.’
    • ‘I love the feeling when people walk in into our place and exclaim, OMG, your house looks so pretty.’
    • ‘I was like OMG, and then pulled my friend away.’
    • ‘I am inordinately excited (OMG!)’
    • ‘Claire: OMG Lisa this is great.’
    • ‘OMG, Bryan, she's so cute!’
    • ‘Of course when I first saw what you're wearing I was like, 'omg, she totally needs a makeover!'’
    • ‘omg … you sneaky girl!’
    • ‘"OMG, think of all the makeup I could, like, buy if I won!"’
    • ‘OMG the exams are drawing nearer and nearer!’
    • ‘Omg where are they?’
    • ‘OMG.’
    • ‘Omg you are completely incorrigible.’
    • ‘OMG, thank you, thank you, thank you.’
    • ‘So, we did, and omg it was beyond delicious.’
    • ‘OMG me too!’
    • ‘Omg, please, some people, like me, are desperate and worried to the core about what they're gonna do with their lives!’

Origin

Early 20th century: from the initial letters of oh my God! (the final elements may sometimes represent goodness, gosh, etc.).

Pronunciation:

OMG

/əʊɛmˈdʒiː/