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Wikipedia definition
1. TicklingTickling is the act of touching a part of the body so as to cause involuntary twitching movements and/or laughter. The word  "tickle" evolved from the Middle English tikelen, perhaps frequentative of ticken, to touch lightly. The idiom tickled pink means to be pleased or delighted. In 1897, psychologists G. Stanley Hall and Arthur Allin described a "tickle" as two different types of phenomena. One type is caused by very light movement across the skin.
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