This term is interchangeable with douchebag and bro
Heiner: Fuck you man, i'm just drinking Natty Ice with my Bros!
Also can be used as a noun to replace bong, piece, stoner, drunkard, druggie, alcoholic, pimp, drug dealer, or moneymaker.
"Man matt, while you always gotta be heinered?"
"Man this is some good heiner."
"I'm just a heiner, what can I say the girlies love me."
"Man Shnitz, you are such a heiner."
"Yo eric, stop bein such a heiner and pass the heiner."
"That heiner is off the heezy, I wish we had some more heiner so we could hit the heiner again, but then again, we aren't heiners so we can't buy that much heiner, damn i wish i was heiner, then all are heiner problems would be solved."
"Like a heiner, like a heiner, what can I say."