When you have your partner lay face up on the bed with forehead extended slightly over the edge. You jump from a foot or so away so that the tip of your penis hits them on the forehead when you land.
Had a few drinks last night and my wife let me jumphammer her. Nailed a couple but my tip now bruised and a darker shade of purple.
by milpoolSK May 18, 2017
Get the jumphammermug.