Someone who believes, despite the fact that they have no future or intellect, that smoking weed, telling everyone about their cool weed stories and uploading photos onto facebook makes them top shit.
"I got so high on the weekend, I must be pretty cool."
"No, shut up you stonerfag."
Someone who does/once did drugs (stoner) with long hair, that is typically bisexual.
Person 1: "Hey, did you see that guy? He's kind of cute."
Person 2: "Stonerfag."