This sound comes from Stitch, the central alien character in Disney’s Lilo & Stitch, released in 2002. Short Stitch voice clips spread widely in fan edits, ringtone uploads and meme compilations because his speech is instantly recognizable even in a second or two. The little “hiii” remains popular in cute reaction posts and character-themed videos because it gives an ordinary greeting a more mischievous, cartoon feel. People also search for it when trying to imitate Stitch’s voice or build nostalgic Disney edits.