1. (n) A twenty-dollar bag of marijuana.
2. (adj.) Really awesome, good, cool, or just something you throw in with other words as a way of showing how excited you are.
Back when weed usually came in $10 dime bags a double bag was $20. When asking your favorite retailer for your weed if you preferred a larger quantity you would ask for a dub, dub bag or as in today’s vernacular a good ol dub sac.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.