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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
Male who is obcest with masturbating.
Your brother is such the jackaloon. He just went back to his bedroom for the 5th time today.
Jackaloon by Senkan January 13, 2009
Singular form of one type of crypto-currency used by pirates.
"I think we need to be on the same wi-fi network to transfer a jackaloon."
"Prepare to be boarded and hand over your jackaloons."

jampaloon 

(noun) When you go on a road trip with nothing but a puppet but you force feed him real food.
Steve's on a jampaloon and he'll be back on thursday.
jampaloon by Seigen sareta October 7, 2014

Jackalyn 

Ambitious. Driven. Intelligent. Amazing. Beautiful. She's a bit crazy at times. She's got a tough skin, inside & out. She is a bit intimidating in person because of her beauty but once you get to know her she's a big teddy bear. She wears her heart on her sleeve. She loves food and Marvel movies! She's very outgoing & loves to have fun! She also loves video games, especially GTA and Halo!
I met this great girl, Jackalyn, the other day!
Jackalyn by richierose December 19, 2017
replacement for stupid, idiot, moron or any other offensive term
maybe you should stop going out with people you find on farmers mingle, you jagaloon
jagaloon by speck19 July 1, 2015
More from Urban Dictionary

proper lad 

a lad that is such a lad that he is a proper lad
person1:did you see bob
person2: ya he was a proper lad
Word of the Day on October 29, 2026
The number of years you are still sexually active
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
sexspan by Dr Kat April 21, 2022
Word of the Day on October 28, 2026
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.
You didn't get any napkins with your takeout pork fried rice? Womp womp.
womp by 175623226 November 3, 2011
Word of the Day on October 27, 2026
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