1. past tense of duff; to mishit or bungle a golf shot, especially a short putt or chip shot
Usage: golf; informal
2. past tense of duff; to push or nudge something
Usage: informal; chiefly British

Examples

• He duffed the putt and missed the birdie.
• She duffed her chip shot from the edge of the green.
• The golfer duffed an easy shot and lost the tournament.
• He duffed the ball into the rough.
• After duffing several shots, she decided to take lessons.