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A cum jar is a jar filled with cum, yup, cum. It is a meme were someone puts a figure and busts a nut on it in a jar
John: What's that?

Gerald: That's my cum jar
Cum Jar by SoLegoPornExists November 19, 2020
A Jar or bottle of cum that is stored and filled up over a long amount of time to then be used to pour over someone else or a figure a girl from anime.
Ladies and gentlemen i would like to introduce you to my Cum Jar...I have waited my entire life for this! *makes orgasm noises while squirting cum out of jar*
Cum Jar by TheExplodingEevee October 2, 2017
The Cum Jar is the way for the men to pay respect to the hundred, the thousand of babies that will never been born, sending their semen to rest in that untouched sanctuary.
- Honey, mom gave me this jam jar with Jar Jar on it as a present for you
- I will put it into good use, I will make it my next cum jar. Real men use cum jars. Not sockets.
Cum Jar by obso September 5, 2019
A rotting corpse that is being used as a storage for blowing loads of semen into the rotting vagina or anus. Corpse will be suspended in a way so no semen can drip out of the orifices.
I miss having deep conversations with my wife, but before she died she said I could use her as a cum jar for as long as I want.
cum jar by thejewishniggernazi January 15, 2018
take a jar and put something in it then cum in it
Person 1 : IS THAT THE CUM JAR !?

Person 2 : yes
Cum jar by JaysonTheson February 4, 2022
Someone who sleeps with a lot of men and let them finish inside them
That Chantelle is always bringing men home she's such a cum jar
Cum jar by Magaluf2015 July 22, 2022