Adjective. To have declared one's alcoholic preferences squarely in favor of rum.
As in: Jack Sparrow, forum, stumbled across the decks of his ship, a condition that naturally had nothing to do with the status of the waters on which it floated, but rather the liquid floating around in him.
(No, let's try that again.)
(Naturally, I blame James Bond.)
Jack Sparrow is known as a forum man. (To clarify, this is most certainly not to be confused with the quality of his conversation.)
(Yeah, I'm not making this one much easier, am I?)
Owing to his forum state, Jack Sparrow believed it was appropriate to be discussing philosophy with a crab.
(Anyway, you get it.)