bag raider 

One who will secretly take small amounts of marijuana from another; many times from a plastic baggy, but more recently from a small glass container.

I come home from work, check my stash and it keeps coming up light. I'm quite certain my unemployed roommate is a bag raider.

bag raider by Glidethroughthemaze April 30, 2016

bag raider 

One who is thought to have been taking small amounts of weed from someone else's weed bag without the others knowledge.

"I think my new roommate may be a bag raider."

bag raider by Glidethroughthemaze May 6, 2016

bag rider 

Any person , male or female , who can help you smoke your dope for extended periods of time; days,weeks, EVEN MONTHS! Without doing a thing in return

bag rider by Anonymous July 26, 2003