This is a very crude synonym to the more technical term, masturbation. Once masturbation is brought to mind, you should understand the imagery that this term conveys. If you still don't get it, think male masturbation, and think of the "stone" as two stones instead of one.
Well, that was a long stressful day... I think it's time to relieve some stress, maybe an afternoon of trying to pull the sword from the stone will help.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi
May I have an order of regular degular buttermilk pancakes? Without all the added jazz? Hold the blueberry smiley face, strawberry glaze, chocolate chips and whipped cream.