When Ricky and Fred are teaching Lucy and Ethel their crazy golf rules (to discourage them from playing), they started with everyone grabbing a club, and Ricky explaining that the "fourth one down from the top goes first". Later, when Lucy and Ethel meet pro golfer Jimmy Demaret, and he agrees to play with them, they insist on everyone grabbing the club as before, but Lucy announces that Jimmy goes first, because he's "second from the top".
Ricky calls the golf tee a divot. A divot is the hole a golf club leaves in the grass on the fairway when it hits the turf before the ball.
Background at the golf course is obviously fake.