Definition of "blueberrying"

The best barrens for blueberrying lay across the harbor.

1908, Henry James Smith, Amédée's Son, Houghton Mifflin Company, published 1908, page 91

Most joyously recalled is the blueberrying — a pleasure I had not had since my youthful days. Huge ones they, hanging thick and easy; that night when I shut my eyes I saw blueberries, a dense pattern, like wallpaper.

1935, Charlotte Perkins Gilman, The Living of Charlotte Perkins Gilman: An Autobiography, University of Wisconsin Press, published 1991, page 231

No work except for blueberrying in August, crab picking occasionally, and making pine wreaths in December.

2008, Carrie Jones, Love (And Other Uses for Duct Tape), Flux, published 2008, page 74