The That's Bullying sound is best understood as an online reaction clip rather than a line tied to a single well-known show or film. It circulates on soundboards and in short-form video edits, where creators reuse short spoken phrases as reusable punchlines for everyday unfair moments. Its appeal comes from its simplicity: the phrase is instantly understood, works without context, and fits teasing between friends, gaming clips, and light-hearted pranks. Because it frames the joke as a mock complaint, it lets creators call out behaviour without sounding genuinely angry, which keeps it popular for playful edits.