To have or have something coming in vast amounts. (Usually said of money, and mostly used in the continuous tense.) I wouldn't worry too much about the Smiths. They're rolling in cash. She's rolling in endorsements right now, but that doesn't mean she has the votes.

Exceptionally wealthy; having large amounts of money to spend. I hear her father is rolling in money, so I wouldn't be too worried about her future. Once we get this plan underway, we'll be rolling in money in no time!