tickler

noun

1. One who tickles.
2. (informal)A person who or thing which amuses or excites.
3. A reminder.

   “Put it in the tickler file for next week.”

4. 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.”

5. (dated, informal)Something puzzling or difficult; a conundrum.
6. (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.”

7. (UK, dated)A prong used by coopers to extract bungs from casks.
8. (dated)A dram of spirits.
9. (slang)Something puzzling; a poser.
10. (Philippines)A small notebook that fits the pocket or pocket notebook.