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A serious affliction that may initially resemble Severe Accute Respiratory Syndrome (SARS) due to the copious amounts of phlegm, coughing, and unsightly/ungroomed appearance. This condition, which applies to specific individuals (aka "Jacks"), is not known to be airborne-contagious, but there is insufficient evidence to determine if it can be contracted through bodily fluids or prolonged exposure in unventilated areas. There is no known cure.
Person A: "What is wrong with Jack, I hope that isn't SARS?"

Person B: "No, it's not SARS. It is JARS"

Person A: "Oh, that's good."

Person B: "No. Actually, it is terrible."
JARS by Dr. Andrews October 25, 2006
Related Words
A group named, "Japanese Animation Research Society" It is full of mostly anime freaks who will cut your head off if you say you hate anime.
<JARS Person> I love anime, man!
<Anime hater> Whatever, it sucks...
<JARS Person> What!? *pounce*
JARS by ladyshera February 20, 2009
Short for Jarvan.

Word is used to express discomfort, intense query, contempt, or other related situations.
Can also be used freely in different contexts and can be legitimized based on a person's experience using the word.

Related phrases such as "jars in my vans," "jassr," "jarvan," "jars morant," "tears in my jears" etc.

Inspired by Jarvan IV ultimate in Riot's League of Legends.
Example: "Jars? What do you mean 100% sugar in bubble tea isn't disgusting?"
Example: "Jars?!?!?!?!"
Example: "Jars morant when :jeffmidlane: malds in leej"
jars by jakeboosted July 28, 2020
That one mate who always has a bong with them.
"You got a Billie for the Mic?"
"Nah mate, Jars is coming. We're set"
Jars by Lil Dey September 30, 2019

Jars of Cancer 

what the cabin smells like at science camp
"It smells like jars of cancer!"
Jars of Cancer by Sheep Squad October 8, 2019

jars of clay 

1. The coolest band ever.
2. Expressing onself in a very poetic and meaningful way.
Nicky: when Anthony found out that I like the Smashing Pumpkins, he asked me to marry him.
Erika: Oh, that is so Jars of Clay.
jars of clay by enksox April 14, 2005