Best definition
Term used in place of Undertale when the content in question is NSFW.
Toby Fox, the developer of Undertale, invented the

term in order to make it easy to distinguish between SFW and NSFW Undertale content.
Most frequently used as a tag for Rule 34 of Undertale.

/r/Undertail is a subreddit for Rule 34 of Undertale.
undertail: define #2
A sexual/NSFW Not Safe For Work version of Undertale. Never look it up for the love of your innocence.
I was dared to look up Undertail the other day… It scared me so much, I couldn’t sleep. Never again, bro.
undertail: define #3
Undertale NSFW tag. Usually used for porn, harsh words, blood.
“They are browsing through the undertail tag. I didn’t know they liked undertale THAT much”
undertail: define #4
a perverted blog of undertale thats really fucked up
person 1: fucking hell undertail fucked me up

person 2: undertale in general is fucked up
undertail: define #5
under the tail. the asshole.

that’s it.
so I was looking at some undertail yesterday
undertail: define #6
Another universe for the hentai-filled game: Undertale. It is under the tail which is an asshole and it’s basically furry hentai.
Undertail is hot as fuck.
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