Do you mean the "you feel lucky, you win!" text?
Ummm.... I think so. But note that normally when you win (or lose) at blackjack, slots, or roulette a message appears at the top right of the HUD display: "you win # of chips" Instead, every once in a while, maybe once every 20-30 plays the message changes to: "you are feeling lucky, you win # of chips."
I wonder if the change in display message reflects a change in luck?
One time I got the "lucky" message I upped my bet and got three blackjacks in a row. Another time, I lost three hands in a row. Just coincidence? Any other experiences?