A bag of heroin. This bag is usually small, the size of a stamp. The name comes from the fact that there is a "brand" stamped on the bag. This bag will contain powder heroin for one dose.
I bought a stamp bag today with "Sour Diesel" printed on it.
by halo fourteen May 19, 2006
bags used to sell heroin in. they are waxed so the heroin powder does not stick to the bag. they are sold legitimately to stamp collectors to keep collectable stamps in.
i just copped a bundle of stamp bags.
by pasquale poo November 20, 2007
heroin, in the little wax bags it comes in
"they went to manchester to cop those stampbags"
by amanda hug n kiss September 02, 2003