Definition of "tickler"

One who tickles.  examples

(informal) A person who or thing which amuses or excites.  examples

A reminder.  examples

A latex condom that has additional protrusions, for enhancing the sexual pleasure of the user.  examples

(informal, dated) Something puzzling or difficult; a conundrum.  examples

(US, business) A tickler file, file cabinet, or similar containing memoranda of deadlines arranged in date order.  quotations  examples

(UK, dated) A prong used by coopers to extract bungs from casks.  examples

(dated) A dram of spirits.  examples

(slang) Something puzzling; a poser.