To touch (the body) lightly so as to cause laughter or twitching movements. To tease or excite pleasurably; titillate: suspense that tickles the reader's curiosity. To fill with mirth or pleasure; delight. See Synonyms at please. To feel or cause a tingling sensation. The act of tickling. A tickling sensation. tickled pink Informal Very pleased; delighted: I was tickled pink by the compliment.