Oh, now I get the joke. :/
For those does not get the joke: there is a fan made alternate universe of Undertale where everyone is a pervert titled "undertail", when I first heard the title I thought it was a crossover between Tattletail and Undertale.
UNDERTALE © TOBY FOX
TATTLETAIL © WAYGETTER ELECTRONICS
tags: crossovers tobyfox
Oh, now I get the joke. :/
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