Apparently, this is something that we no longer have to be afraid of.
There is now an online junk food store that delivers available to those living reasonably within the HRM. Check out their service map to determine if they are in your hood.
Their menu is quite extensive, and the delivery charges are reasonable so there's really no excuse. If you're drinking or toking or both and you got the munchies, this is definitely the way to go.
It's appropriately called "Room Service". I dare you to try it.