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A bong piece or bowl (or "Cone" as it is referred to in Australia where the term was coined) that has ash stuck in it, thus forcing an individual to sprinkle tobacco on top and smoke the unpleasant ashy bowl or "sink the cone".
Dude I can't get the ash out of the cone piece I'm just gonna sink a graveyard cone
When you cant be fucked cleaning ash out of the cone piece, so you just chuck some baccy on top and sink it.
After Connor finished complaining to Stuart about his filthy cone piece, he ordered a graveyard cone for brunch.