Bottom Strike

When two gay men in a relationship decide neither of them will bottom for each other. Thus resulting in non-anal intercourse until the bottom strike ends.

In baseball, a pitch that would normally be called a ball, but because the home team is up to bat with a very large lead, the umpire has widened the strike zone so much so that said pitch is called a strike. The pitch is therefore only called a strike in the bottom half of the inning. See top half ball.