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A person who acts like a complete jackass all the time despite their perceived age and wisdom, particularly whilst consuming alcohol.
Man that guy, Jake is a real Jagaloon all he does is get drunk and fuck with people.
Jagaloon by Bacokaj broos February 8, 2018
Any one adult person who engages in acts of a mentally retarded child. Someone who clearly demonstrates a lack of commitment to maturity and the responsibilities that come with it.
Dr. Doback in Step Brothers to his 40 year old son living at home who cant get a job or act like an adult:

"You Jagaloons! You're FAILURES!!"
Jagaloon by mahatma ice August 4, 2009
The guy in a bar who wears a (pink) polo shirt, two sizes too small, with a popped collar; and probably drove there in a Honda Civic.
Bra 1: I Just ordered that Jagaloon an appletini.

Bra 2: Good, that will go nicely with the bag of dicks he’s about to eat.
Jagaloon by PhuzzyLogic July 13, 2009
Lunatic players competing against teams coached by Saskatchewan’s Byron Bitz.
Those Regina Jagaloons are a few spokes short of a wheel.
Jagaloon by FlyerFire December 25, 2021
The guy in a bar who wears a (pink) polo shirt, two sizes too small, with a popped collar; and probably drove there in a Honda Civic.
Bra 1: I Just ordered that Jagaloon an appletini.

Bra 2: Good, that will go nicely with the bag of dicks he’s about to eat.
Jagaloon by PhuzzyLogic July 13, 2009
Noah and Jacob are being real jagaloons!!!
Jagaloon by chicago416 May 4, 2009