Double Bagger (1875)

“Both sides played a good fielding game, Waitt bearing off the honors with four clear hits, two of which were double baggers, besides making a brilliant double play on a difficult running catch.” St. Louis Globe-Democrat, October 24, 1875, p7

Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1ST USE. 1878. “Peters hit for a base, second on Goodman’s out, and home on Foley’s double bagger” (Milwaukee Sentinel, June 28; Peter Morris).