'Bogy' definitions:

Definition of 'bogy'

noun

An unidentified (and possibly enemy) aircraft [syn: bogy, bogie, bogey]

noun

An evil spirit [syn: bogey, bogy, bogie]

From: GCIDE

Bogy \Bo"gy\, n.; pl. Bogies. [See Bogle.] A specter; a hobgoblin; a bugbear. "Death's heads and bogies." --J. H. Newman. [Written also bogey.] [1913 Webster]
There are plenty of such foolish attempts at playing bogy in the history of savages. --C. Kingsley. [1913 Webster]

From: GCIDE

Bogey \Bo"gey\, n.; pl. Bogeys. [Also bogie and bogy, plural bogies.]
1. A goblin; a bugbear.
Syn: bogeyman. [Webster 1913 Suppl.]
I have become a sort of bogey -- a kill-joy. --Wm. Black. [Webster 1913 Suppl.]
2. (Golf) a score one stroke over par for a hole; formerly, the definition of bogey was the same as that now used for par, i.e., an ideal score or number of strokes, for each hole, against which players compete; -- it was said to be so called because assumed to be the score of an imaginary first-rate player called Colonel Bogey. Now the standard score is called par. [Webster 1913 Suppl. +PJC]
3. (Mil.) an unidentified aircraft; in combat situations, such craft not identified as friendly are assumed to be hostile. [PJC]