Definitions for "Tickling"
exciting by touching lightly so as to cause laughter or twitching movements
light touch that sometimes causes a laughter response.
Tickling is the act of touching a part of the body, so as to cause involuntary twitching movements or laughter. Such sensations can be pleasurable or exciting, but (particularly in the case of relentless heavy tickling) are often considered highly unpleasant.