Well... Mart was on the right track with the Roman numerals. Millenium Club Member, a club you entered on your 1000th post, was coined by MCA.
Upon members reaching their 2000ths post, they entered the MM Club. The Roman Numerals MM stand for 2000. From there it just got twisted. I cannot look into MCA's mind and even if I could I'd probably go blind, but I think he adopted it to mean Multi-Millenium Club.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
