spacebagging 

The act of taking another person's books out of their back pack, turning it inside out and replacing ther books into it. Then they zip it up and awaiting a reaction from them. This is done as a practical joke when someone leaves a room (classroom, dorm etc.).

Yo, I just spacebagged Joe.
Spacebagging is so much fun.
I hate when people spacebag me.

spacebagging by I love spacebagging May 3, 2011

Spacebagging 

A form of alcohol abuse, "spacebagging" is when a person opens a beer at a party and then, for whatever reason, doesn't finish it.

This despicable act earns the offending individual the title of "Spacebag". As a penalty, the guilty party is often forced to finish the warm beer.

Don't open a new beer unless you intend to finish it. Spacebagging is strictly prohibited in this home.

Spacebagging by Timbrocks September 5, 2012