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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

Jagaloonery 

The act of making a bad or misinformed decision, and doing it for lulz. Also, being totally ignorant of common societal practices and expectations.
It was jagaloonery when the Ravens lost.
Jagaloonery by RPRIII January 19, 2009

Geriatric Jagaloon 

A fag who is fucking incapable of any fucking thing he or she tries. Completely loves penguins to suck their dick and is gay as a queer.
John: where the fuck is Alex?
Derek: that geriatric jagaloon problably got lost in his own shit.
One who acts in the manner of a jagalop. Etymology of the term is unclear but sourced from regional US American dialects. A non-gendertyped term that connotes a jagaoff who models his behavior on male gigolos.
Asking what a jagalop is such a jagalop move... Just ask James..
jagalop by yositune October 29, 2020

Jagabond 

1.A person who engages in act of Jagaloonery while being particularly sloppy or uncontrollable.
2. A combination of a jagaloon and a vagabond.
"When Matt got drunk in a pink collared shirt he acted like a complete jagabond."
Jagabond by Basset-Hound September 15, 2009