Definition of tickles:
(v) :
(transitive) To touch repeatedly or stroke delicately in a manner which typically causes laughter, pleasure and twitching.
(n) :
The act of tickling.
(n) :
An itchy feeling resembling the result of tickling.
(v) :
(intransitive, of a body part) To feel as if the body part in question is being tickled.
(v) :
(transitive) To cause delight or amusement in.
(v) :
(transitive) To appeal to someone's taste, curiosity etc.