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This information is based on alternate scenes or materials, and is not considered canon within the overall plot of the AU.
Underfresh is an AU where everyone speaks in slang terms. Everyone wears clothing that makes them look like 90s' nightmares, uses skateboards, and protects the impressionable youth from doing drugs. There are a lot of bright colors and explosions as well.
About the AU
In this world, it’s sk8 or be sk8ed. This AU is a comedic parody of Undertale characters as 90′s skater culture mixed with the meme culture of the 2010′s. All of the characters wear bright pastel colors and have various sayings, slang, and memes all over their attire. Papyrus is the only one unchanged, still wearing his Cool Dude attire. UnderFresh was created by LoverOfPiggies on Tumblr.
The Creator of UnderFresh, LoverOfPiggies, has had Fresh!Sans pop up in most of her UnderTale related works. Revealed during a few panels of Ask Error, a Sans, flipping in and out of a "Fresh" state, talks about a depressing topic. It is implied thats UnderFresh is not only an AU, but an infectious AU, capable of taking over other AUs. For every AU, there is a Fresh version.
According to LoverOfPiggies, UnderFresh is not technically an AU, as it only has one character, Sans. He is actually a parasite with no home that takes the form of a Sans., who is incapable of feeling emotions. According to the MommaCQ comic on Tumbler, Fresh got his sunglasses at the mall with his brothers Error and Geno, and Error's new friend, Ink. Fresh was a well-structured character, but the fandom wouldn't listen and thus turned a great character into a monstrosity.