Be on a roll
Definition 1 of 1
Pro Tip 1/3Colloquial Use
Used mostly in casual conversation, not in formal writing or professional contexts. 
After winning the quiz three times in a row, Lisa said she was on a roll.
Pro Tip 2/3Positive Vibes
Expresses a sense of optimism and is often said to encourage oneself or others. 
The team has scored yet another goal. They're really on a roll now!
Pro Tip 3/3Non-literal Success
It's metaphorical and doesn't mean physically rolling; it refers to achieving success continuously. 
Ever since she got that promotion, she's been on a roll with new business deals.