A generic definition would be the stock price that would put cause the least amount of in-the-money value for all open interest, both puts and calls, for a given expiration period.
In the case of the table below, the value of all of the September open interest based on a particular Friday close goes down until $84 is reached in then goes back up. Thus $85 would be the "Max Pain" point.
Value of All September Open Interest (in millions) 92 $468 91 $425 90 $381 89 $368 88 $354 87 $340 86 $327 85 $313 84 $329
Theoretically this concept makes a lot of practical sense but is often times proved wrong.
That being said, I do believe stock is overbought and with Max Pain $8 below current stock price there might be some room for a gap downward. IMHO.
The current price is around 94 (and not 92) so at the current price the value of all September Open Interest (using your numbers)would be over $550 million, that is $240 million more than the max pain. That is a huge difference.
A Friday close at current or higher price would result in a huge payout to option holders, majority of them are the call holders. Most of the puts are expiring worthless.
Also with max pain at 84-85, that puts the Max Pain $9-10 below current stock price. I do not know how ebay reacts to max pain, but a $9-10 difference is big.