A more detailed description of the joke is posted below:
This cartoon shows a group of golfers dealing with winter conditions on the course, where the green has frozen over and is being smoothed like an ice rink. The joke plays on how golfers talk about “fast greens” while facing an obviously extreme situation. It highlights the contrast between normal golf advice and unrealistic playing conditions during cold weather rounds.
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Side note. Do you need a Zamboni? Of course not. But if you did, you can buy a ice rink resurfacer here on Amazon.