A unicorn-tailed soft bottom is a person who is a designated bottom in the furry community. This individual will insert a soft-tailed butt plug into their anus and engage in sexual activities, mainly double anal penetration.
p1 - "Hey Gerard! Did you hear about Dillon? He's a UTSB!"
p2 - "That furry faggot? What's a UTSB??"
p1- "He's a unicorn-tailed soft bottom now, he likes to wear butt plugs with fancy tails on them while getting ass fucked by his friends."
by professor plums August 18, 2021
mugGet the unicorn-tailed soft bottommug.

Unicorn Tail

A nerds rope hanging out of an asshole, usually but not exclusively in a sexual context.
"hey babe I'm getting hungry. could you feed me another unicorn tail please"
by ChiefQueef6669 September 18, 2023
mugGet the Unicorn Tailmug.