Mr Tickle is a character from Roger Hargreaves Mr Men books, first published in the early 1970s, recognisable for his extraordinarily long arms and habit of tickling everyone he meets. The line sums up that whole character in one short quote, which is why it travelled easily into meme edits and short reaction clips online. Instead of needing any setup or episode context, the phrase works on its own as a joke cue, and its connection to a familiar children's character keeps it feeling nostalgic and harmless rather than mean spirited.