Originally Posted by FEARFACTOR
What is an MGR hit?
MGR is your Monthly Gross Rake. That's the amount the poker site
estimates it collected from you in rake, i.e. rake paid for tournaments + the rake paid at the cash tables you played divided by the number of players dealt at each hand, minus additional expenses such as transaction fees when you deposit, overlays in tournaments you play, or frequent player points spent.
That's the amount they use to determine how much rakeback you can get (if you do have rakeback, of course)