Bagging:
If you check out the Shortcat.pro track guides you will see some tracks that say: Runner, Shroomer, Drafter and Bagger.
A Runner is track with very few shortcuts, and you want to be at the front!
A shroomer is a track where the best strategy is to get mushrooms at the start and take some early shortcuts, after this, they become Runners. A Drafter is a track where the best strategy is if you’re at the back, get a draft and move up to the front, after this they become Runners.
A Bagger is a track with a lot of shortcuts that you want speed items to take, you want to be in 9th or worse to get the best items, so slowing down to get them is a really good strategy.
If you want to see some high-level usage of all these strategies, check out some of these videos:
Shortcat:
Cheating in Mario Kart by Using the Pro Guide Online
The FINAL Showdown – Bagging VS Frontrunning | Mario Kart 8 Deluxe
Yosh1Bro 