The phrase "massive payday" refers to a large amount of money earned or received from a job or investment. It means making a significant profit or getting a huge sum of money. Full definition
He went from massive paydays to peanuts. (fortune.com)
Some companies have successfully tapped Facebook's massive user base to earn millions of dollars, or seen massive paydays through acquisitions — or both. (inc.com)
Between his superb defending abilities and accurate passing, Kante has been the breakout superstar of the 2015 - 16 season and could be set for a massive payday from a top club. (caughtoffside.com)