Sheldon Lee Cooper is the socially blunt theoretical physicist played by Jim Parsons in The Big Bang Theory, the CBS sitcom that ran from 2007 to 2019. His formal speech, literal thinking and smug corrections made isolated lines easy to lift from episodes and share out of context. Short Sheldon clips circulated widely on soundboards, in reaction videos and in meme edits during the show's peak popularity and afterwards. This you dog moment survives because the contrast between his serious delivery and a slangy insult remains instantly recognisable to fans.