tickler

noun10

1. •
   One who tickles.
2. •
   A reminder.

   • Put it in the tickler file for next week.
3. •
   (US) A tickler file, file cabinet, or similar containing memoranda of deadlines arranged in date order.

   • The moment she bought any item of stocks, any commercial paper or other securities in the course of her Wall-street operations, she at once wrote it down in the tickler. — 1862
4. •
   (informal) A person who or thing which amuses or excites.
5. •
   (informal, old-fashioned) Something puzzling or difficult; a conundrum.
6. •
   (slang) Something puzzling; a poser.
7. •
   A latex condom that has additional protrusions, for enhancing the sexual pleasure of the user.

   • I could tell in advance if they were screamers, or leatherettes, or buggers, or great head-givers, or into toys and ticklers – I had it down to an art. — 2005
8. •
   (Philippines) A small notebook that fits the pocket or pocket notebook.
9. •
   (old-fashioned) A dram of spirits.
10. •
    (UK, old-fashioned) A prong used by coopers to extract bungs from casks.