An alternate universe (au) of undertale where the main characters (and maybe more) are swapped.
You: Hey, whats Underswap?
Jimmy: Pretty much undertale but the characters are swa-
You: Oh, its a knockoff.
by The great Vicente December 2, 2016
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A weed addicted skeleton with cheesy jokes and a short blueberry brother.
Person 1 : DUDE IT'S UNDERSWAP PAPYRUS---
Person 2 : Who?
Under Swap Papyrus : *Slap*
by WeedDaddy April 3, 2017
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Underswap sans also known as blueberry or blue is an AU of sans from undertale. Blueberry can be seen as a sweet adorable person you just want to hug.
Underswap sans gave Kyle a gift, they're so nice.
Blueberry is just so adorable and friendly.
Don't you just want to give blue a hug?
by Alice Butter March 13, 2021
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A simple alternate universe of undertale where the role of all the characters are swapped thus making it very weird and fun to play. It defies the logic of gaming.
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Alfred: Hey, do u know about underswap?
Larry: That game is an insult to logic.
Alfred: Alright, screw off normie bastard.

You don't know what exactly an au is.
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by Retardost December 13, 2021
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He is basically UnderTale Sans but in Papyrus body so he has the body of UT Pap but the personality Of Sans. (btw Us stands for underswap)
Underswap Papyrus: hey bro can you get the honey for me..
Underswap Sans: But brother you are Literately 2 feet away from it!
Us Papyrus: but u are too. :|
Us Sans: FINE! But only this once brother. Next time you need to get up and get is your self.
Us papyrus: k, thanks bro.
by TheBiggestUndertaleFan November 22, 2021
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Underswap Sans also known as blue or blueberry is an AU of sans from undertale. Underswap Sans can be depicted as a kind,sweet, and adorable person who you just want to hug.
Underswap sans is so kind, they gave Kyle a gift.
Blueberry is so adorable I can't get enough.

Don't you just want to give blue a hug.
by Alice Butter March 13, 2021
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a take of the undertale fan universe called underswap being currently developed by the ultra team.
UT!underswap is a take of the undertale fan universe called underswap being currently developed by the ultra team.
by idonthavetimefodis February 24, 2021
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