Rabbit hunting
Rabbit hunting is asking to see the cards that would have come on later streets after a hand is already over, just to satisfy curiosity.
Rabbit hunting means peeking at the community cards that never got dealt because the hand ended early. Once everyone has folded or the pot is awarded, a curious player asks the dealer to reveal the cards that would have landed on the turn or river. It changes nothing about the result; it just answers the nagging "what if I'd stayed in?" question.
It usually comes up right after a player folds and then wonders whether they'd have hit their draw. In a home game with practice chips it's harmless fun, but in cardrooms and most online play it's discouraged or not allowed because it slows the game down for everyone waiting on the next deal.
For beginners, the friendly advice is to skip the habit. Seeing the card you "would have" caught can sting and nudge you toward chasing weak hands next time, when your fold was actually the right call. Judge your decision by the information you had, not by the card that never mattered.
Example
You hold 8♥ 7♥ and fold to a big bet on a flop of A♥ K♥ 2♠, where your two hearts give you a flush draw. After the hand, you ask to rabbit hunt and the dealer peels the turn: 6♥, completing the flush you'd have made if you'd called.