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."
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.