That's what they call it when the poker room has to add money to the prize pool to make the guarantee. And the overlay at the Bodog sunday event is a bit of a legend in the online poker player community.
Basically, once all of the players who are playing in the tournament pay their buy-in, the poker room takes it and puts together the prize pool. It seldom equals the guaranteed prize pool of $100,000. So, the poker room adds money to it, to get the prize pool up to the required $100k.
How much have they been adding?
On average, about $30,000. Which is a TON. And that makes for what is probably the BEST value for a tournament poker player online.
The Math for a $30,000 overlay in this event? $100,000 divided by 700 players equals a tournament valued at $143 buy-in. So, right from the start you're at payouts that resemble a tournament that would be priced $43 higher than what you're paying.
That, is a good reason to play the Sunday $100k Guaranteed at Bodog