He's talking about moving the decimal to automatically and immediately increase relative BTC value.
Right now there is a fledgling economy where real goods and services are bought for bitcoins. Because these are also bought in other currencies like the dollar there can be established an exchange rate between bitcoins and other currencies. Right now that exchange rate, according to Mt.Gox is about 1 BTC per 5 USD.
However, there is no hard fast rule about what the exchange quantities should be. This is why the OP talks about "PUTCALL-SPLIT". Puts and calls are terms related to stock options, but the OP really means a "stock-split".
Stock holders generally favor these with little reason to be against them because net worth doesn't go down (it often goes up). If I own 500 shares of GOOGLE and the company does a 2 for 1 stock split then I now own 1000 shares of GOOGLE. I don't own any more of the company because the company also doubles the amount of shares it has total. Meanwhile, in the stock market if the price was $500 per share it will likely drop immediately to $250 per share. I've lost no net worth, but the cool thing about stock splits is for strong companies (like Google) the price per share usually returns to its pre-split levels.
The concept to take away from this is that subjective value can be changed by adjusting ownership quantities with no ill-effect to owners.
Remembering goods and services are now traded for bitcoin: let's say it takes 1 BTC to buy 1 pack of socks, or 10 btc to secure the cheapest thing from Silk Road (I wouldn't know
). If everyone, at least a good majority, decided to move the decimal 2 places to the left for every BTC transaction they would lose no value, and the sellers of these items would either refuse the change or go out of business, for BTC at least.
The move would have to be coordinated where everybody switched at the same time to catch on. If they did sellers would likely lose no value either because the exchange rate between USD and BTC, like stock splits, would slowly return to the pre-shift level. The difference would be that every BTC holder would have 10 times the unit quantity value-wise (100 BTC would be equivalent to 10,000 BTC).
The OP suggests 05/11/2012 12:00h Greenwich (UK.time) as the coordinated time to switch.
Of course, if the move isn't coordinated it leads to much head scratching and many canceled transactions.