It's rare you play 18 really good holes of golf in a round. Usually, there are a bunch of crummy ones in there. That's what makes "T and F" such a fun game to play with your golf buddies.
There are a couple of different ways to play "T and F," but the game is named after the holes on the course are that start with a T or F. So, hole nos. 2, 3, 4, 5, 10, 12, 13, 14 and 15.
In one variation, either individuals or teams can play so that only the T and F holes count toward the score, either total or best ball.
Another way to play is almost a derivative of alternate shot, where two- or three-person teams can have their scores count on specific holes. In the two-player version, the teams could alternate on which T-and-F holes whose scores count. Or, one player's score counts on the T-and-F holes and the partner's score counts on the other nine. With three-player teams, each player count get three holes to count.
There's no shortage of ways to spice up your golf game, so hopefully T and F might make you say TGIF.