Sexual activity involving the insertion of a golfball (of any color or brand) into the anus of a male's sexual partner, followed by poking (or "putting") the ball with his member while inside the rectum.
In a statement: "I got a hole-in-one last night while playing butt putt"
Or, could be an answer to a question: "Why are you walking funny?" "Butt Putt..."
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