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1.
Someone who's really stingy with their weed. Should another person have the misfortune of expressing a desire to share said weed, they are met with coldness and greed at the cruel hands of the pot goblin.

Pot Goblins usually resemble a typical pothead with a dirty ski cap loosely containing their greasy, mop-style haircut. However, they have an impish gleam in their eyes when looking at their cache of pot, like Gollum from Lord of the Rings.
"Hey, Brad won't share any of his weed!"

"Dude, don't be a fucking pot goblin!"
by Alvin Poppincock September 29, 2009