1. In baseball, a hit of the ball that results in the batter being able to reach second base. That double-bagger from Mitchelson puts his team within striking distance of a victory here today.
2. A particularly ugly person, i.e., one who would need to wear two bags over their head in order to conceal such ugliness. She had a few too many drinks and ended up going home with some double-bagger who'd been leering at her all night at the bar. I know I'm not the prettiest person in the world, but I'm no double-bagger or anything.