The phrase comes from the Costco Guys, the father-and-son TikTok duo AJ and Big Justice, who built a following with enthusiastic Costco shopping trips, food-court reviews and family-friendly catchphrases. Their loud, joyful style turned ordinary warehouse visits into viral clips, and fans began repeating lines like this one in comments, remixes and edits. As the duo appeared in more videos and collaborations, the greeting became shorthand for Costco fandom itself. Today creators use it to signal a haul, a tasting or a joke about loving the store a little too much.