To have a pair in your hand that is higher than the highest card on the board.
An overpair is a pocket pair that is higher than any card on the board. For example, if you hold pocket kings and the flop is Q97, you hold an overpair.
A wired pair higher than any card on the board in a Texas Holdem or Omaha poker game. For example, holding J-J in Holdem with a flop of 3-6-9.