A back raise in poker is when you re-raise after calling during the same betting round. It doesn’t happen very often in poker but can be effective as a deception tool you can use to trap players who tend to raise aggressively.
Back Raise Poker Example:
The BTN raises $20, you call from the SB position, and the BB player 3-bets by making a $60 bet. The player in the BTN seat folds. As the action comes to you, you decide to re-raise to $120. This action is called back raising.