Definition of b'day in English:

b'day

(also b-day)

noun

informal
  • ‘it's my sister's b'day next week’
    short for birthday
    • ‘Well, yesterday was my b'day and my good husband insisted that we should go to some wonderful restaurant and eat.’
    • ‘Tuesday night, they took over the San Remo room at Tony's to celebrate Cerón's b'day with 32 friends.’
    • ‘Apart from the little chat we had on his b'day I've not heard from him since.’
    • ‘Then on Sunday, I'm gonna try and pop up to my parent's house in Dundalk - it's my sisters b'day next week, so I'd like to drop a prezzie up.’
    • ‘Best of luck with the interview, and happy b'day by the way.’
    • ‘Less that 26 hours till Charlton kick off the new season and only a few hours till my B'day.’
    • ‘To make it even more special, my sister-in-law's family all thought it was my b'day and they got me a cake and cards.’
    • ‘I almost never honor my celebrations - I rarely do much for my b'day or other holidays.’
    • ‘Tomorrow's my b'day!’
    • ‘I was there a few weeks ago for a B'Day Party which was held on the first floor bar.’
    • ‘He trooped in with a loud cheer and congratulated the b'day boy.’
    • ‘Later, the b'day girl had an absolutely wild time on the dance floor!’