A shadow bagger is a stranger who in public will stand so close behind you that you can't see them and they are out of your peripherals. Only when you turn your head or back/bump into them you notice them!
"Last night at the party I stepped out to check out the moon and I had no idea that Shadow Bagger Chris was standing behind me the whole time...next time I'm throwing an elbow!"
by Gunno 2 November 6, 2017