singletail

From single +‎ tail.

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singletail (plural singletails)

1. A variety of goldfish with an undivided tail.
2. (BDSM) A whip with a single lash.
   • 1999, Katharine Gates, Deviant Desires: Incredibly Strange Sex:

     Velvet also whips him, beats him and torments his cock and balls (by kicking, squeezing or the judicious use of a singletail whip) on a regular basis — as often as he needs and wants, but at least several times a week.

   • 2008, Jennifer Campbell, Allison's Training, page 110:

     Stopping her tapping, Angelica belted the singletail, and grasped Allison's lead pulling her tits up sharply to render her helpless.