the act of baking desserts (cookies, cake, brownies) while getting stoned.
Not only is the subject of the action getting baked, but they are also baking goodies to snack on (which all stoned people love). Thus, the subject is double baking. This act usually involves preheation.
Dude, I love going over to Riz's house for double baking. It's the only way to eat cookies.