This is a tikified version of Admiral Nelson's head with a small tiki at top draining the delicious contents out of his skull. Based on the legend that Nelson's body was preserved in a brandy/grog/rum cask that was unfortunately drained by drunken sailors over the course of the voyage home.
From Strong Water Anaheim:
"We are absolutely thrilled to unveil the highly anticipated 'Tappin’ the Captain' mug, meticulously crafted by the talented duo, Kevin & Jody, exclusively for Strong Water Anaheim. This extraordinary limited edition creation, with a mere 500 in existence, is an authentic gem destined to grace the collections of discerning enthusiasts.