n. or adj. A middle-aged man whose prime has long passed, and is in denial that the glory days ever ended. Particularly applies to ex-jocks who now work as ineffective high school math or science teachers just so they can coach football and flirt inappropriately with cheerleaders.
Check out Glory Days over there, with his tan and his arm around that underage girl.
Days we remember as better and more fulfilling than today. Glory days are often associated with popularity and successful party throwing.
Remember our Pop Culture Spelling Bee? Those were the glory days.