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a publicly acceptable way of calling someone a jackass. someone who recently has done something stupid and deserves to be called a jackass, but there are people around that wouldn't appreciate that and so you simply call them a jackaloon.
"Dude what's wrong with your toaster?" "You have to plug it in first you jackaloon."
jackaloon by inandaroundyourmouth February 3, 2010
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
A person that is both a jackass and a lunatic.
There's no reason why a sane person would ever put mayonnaise in their pockets, he is a certifiable jackaloon.
Jackaloon by gtrslayer284 March 12, 2019
That jackolone is really a piece of work
Jackolone by Matamike March 15, 2022

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