Stowaway Stoner

A person who smokes weed regularly but, instead of getting weed from their own dealer, stows away in large groups of people (usually acquaintances, friends-of-friends, etc.) in an effort to score a free toke or two without having to go through the legwork of acquiring their own marijuana.

Person 1:
"That girl over there totally just tagged along to mooch weed off of us. We hardly even know her..."

Person 2:
"Yea, I know. She's such a stowaway stoner."