To invade the opponent's territory quite near the end of the game, with no particular plan, but with the hope that the invasion works or that the opponent makes a mistake.
emeraldemon: This sequence came from a game I just played on KGS. The plays at and didn't accomplish anything and since and would have to be played eventually anyway, they lost points. If had been at it could have made a reasonable reduction. Black won this game by 4.5, so that may very well have been the losing sequence.