Profit boost tokens are special price boosts which you can apply to the bet of your choice. For example, you might receive a boost which can only be used on football markets, but you can apply the boost to any bet on football.
A good example of this is the below boost from Ladbrokes:
This can be used on a stake of up to £50.
You will get an option on the bet slip to apply this boost. If you find a close match on the OddsMatcher you can then lock in a profit by using the standard calculator in normal mode and changing the back odds to the boosted odds.
This guide explains more about these offers, and how they can be used.