Definition of (I) don't mind if I do in US English:

(I) don't mind if I do

phrase

informal
  • Used to accept an invitation.

    • ‘Suddenly a grenade landed next to him, ‘Oh, don't mind if I do.’’
    • ‘‘In that case, don't mind if I do,’ and the blonde dived towards Sato.’
    • ‘Patrice handed them to me in a bag with ‘Uncork New York!’ written loudly across its belly, and you know, I don't mind if I do.’
    • ‘‘Thank you, don't mind if I do,’ and Francis took a seat in one of the two chairs in front of Henry's desk.’