The phrase comes from DJ Khaled's run of motivational Snapchat videos in the mid 2010s, when his daily affirmations turned into a major internet moment. Talking directly to the camera, he would praise his audience and team with lines like you smart, you loyal and you grateful, delivered as serious life advice. Clips were reposted across Vine, Twitter and YouTube, and the compliments became a shorthand for hyping someone up. It is still used because the delivery is sincere enough to celebrate people, but exaggerated enough to be funny.