From Lost Temple Traders:

"Two shots of rum…or was it three? Who can remember. It’s always a bit groggy. All we know for sure is there was an octopus bartender, a giant clam, and a lot of rum. Groggy Grotter is manufactured by Monkey Skull. This mug is a Limited Edition of 100 and is expected to ship late December/Early January."

The second edition Groggy Grotter is glazed in a green and purple color combination.