undertale, is when you send a message on a groupchat, but the internet doesnt let the message send while you are still able to the see other group memembers interact
¨dude did you saw the new chapter of kaiji
¨yeah¨

*uhm guys, my messages arent sending, oh my god, im trapped in undertale, somene help me, GUYS STOP TALKING I MY MESSAGES WONT SEND*
by kemafili May 26, 2019
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Cancer game meant for morons and idiots
Wow! Look at all the undertale being played right now!
by Starvingcannibal December 16, 2015
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Undertale (previously styled UnderTale) is a game by Toby Fox that released in 2015. In Undertale, you can either spare the monsters you meet, or kill them mercilessly. The game has many diverse characters such as Sans, Papyrus, Toriel, and even more.
Undertale is good.
by The7Guy July 20, 2020
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a simple rpg thats brainwashing the internet. (even known how stupid it is)
Undertale is brainwashing us.
by Undertale November 21, 2015
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A really good game made by Toby Fox that people insult and say is cancer because they're jealous of how great the game is AND HE SWIMMING IN MONEY LIKE SCROOGE MCDUCKEHHHHHHHHHHHHHHHHHHHHHHHH
Hater: "undertale sux"
Me: "Shut yo mouth, you're just jealous."
Hater: "fu-"
*ABSOLUTELY DESTROYS HATER WITH DAS KARMA*
"Get dunked on, sucker."
by Ye Olde Gomibaka October 25, 2017
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