Exactly the same thing as getting sacked, getting 'bagged' means to get kicked or just plain hit hard in the testicles, or, your 'bag'. Very common where I'm from.
To remove the contents of another's bag, proceed to turn it inside out, replace the contents, and zip it back up again, preferably without the victim knowing.
Created at Herne Bay High, similar to being coated
Rex: aahhhh i bagged rory yesterday.
Sam: was it lolworthy Rex: how could it not be?
Sam: did he over-react?
Rory: FUCKERS!!!
to be the recipient of a plastic bag over the head during a sex act. This is common terminology in the Breath Play community. The bag is usually sealed by hand, tape or other method and is a consensual act.