The catchphrase comes from television advertising featuring the Kool-Aid Man, the smiling pitcher mascot who became a fixture of the brand’s commercials during the 1970s. In many ads, he answered calls for refreshment by bursting through a wall and declaring “Oh yeah!” The combination of property damage, cheerful confidence, and a booming voice made the entrance easy to parody. Clips and imitations later spread through online videos, remixes, reaction posts, and memes, where the line remains shorthand for an exuberant arrival or emphatic approval.