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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
Related Words
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