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1.
When your so drunk you forget how stoned you are. So you decide to smoke more. This in turn shifts the ratio of hammered to stoned causing you to now forget how hammered you are and to continue drinking.
Person A, "Dude where have you been the last hour??"

Person B, "(In drunk voice) I'm hammer stoned"

Person A, "It's a vicious cycle.."
by ask-two March 20, 2011
 
2.
When you are beyond the boundaries of reality due to a combination of marijuana and alcohol. A person who is hammer stoned is usually someone who has a low tolerance for weed but smoked because they were already legally intoxicated.
After finishing those four locos and smoking that joint from the bible paper, I was fucking hammer stoned.
by Walt Nastie March 20, 2011