A dope stoner is someone who smokes dope (meth, crack) without feining for it. As if they were just smoking weed. Not a common breed, seeing as most people that smoke dope are fiends.
"That fool packed a gram in the pipe, took only one hit and let the rest of us smoke it all! Like it really didn't even matter!"
"Yeah, I heard that fool what was a strait dope stoner."