Originally posted by GunsForBucks:

never crafted one... are you saying it is a consumable health item? Or does it enhance potions you make or something?

Thought it was only cosmetic / decorative.

Left clicking with it equipped will make you consume whatever mead is closest to your top left inventory slot. At first I thought that if you had poison resist active for instance and you tried to use the mug again that it would pull from the next stack over. This would make it at least sort of useful because you could quickly go through your potions and heal without having to have more than one mead in your quick slots. Unfortunately, if poison resist is active and it's also your top leftmost slot, and you try to use the tankard again you get an error message. So yeah, pretty useless atm.