The line comes from Shrek, the 2001 animated film, where Shrek borrows the famous closing line from Babe, 'That'll do, Pig, that'll do,' and redirects it at Donkey. In context it is a quiet punchline after Donkey's energetic behaviour, contrasting Shrek's gruff patience with his friend's chatter. Clips of the moment later circulated on soundboards and in edited videos, where the short, self-contained delivery made it easy to reuse out of context as a polite shutdown for anything excessive, finished, or mildly exasperating online today.