Definition of "afther"

"You didn't tell mother what you're afther, did you?"

1848, Anthony Trollope, The Kellys and the O'Kellys‎

He pronounced these words afterwards, with great solemnity:-- "Andrew Jackson, if I catch ye fightin' once more, I'll be afther givin' ye lave to lave the school."

1904, Winston Churchill, (Please provide the book title or journal name)‎

"Be afther goin' to it," said Olson.

1918, Edgar Rice Burroughs, The Land That Time Forgot‎