Bogey (noun)

1. In golf, a score of one over par on a hole.
2. A person or thing that is difficult to get along with, beat, or defeat.
3. A mysterious or unidentified aircraft, especially one considered to be hostile or a potential threat.

Origin:

The origin of the word is uncertain, but it may come from the middle french word 'bogue' meaning 'a toy' or 'a scarecrow', or the scottish word 'bogie' meaning 'a supernatural being' or 'a bugbear'. in golf, the word was used to refer to a score of one over par on a hole.

Examples:

1. The golfer made a bogey on the final hole, but still managed to win the tournament.
2. The golfer's bogey was a result of a missed putt.
3. The team had a difficult time with their bogey, the opposing team's star player.
4. The fighter pilot reported a bogey on the radar, and the air defense system was put on alert.
5. The bogey was a UFO, according to the eyewitnesses, but it was never officially confirmed.