"I know ball" trend surges on TikTok in 2025, with users proving niche skills via split-screen videos and the "plug walk remix" audio.

The slang phrase "I know ball" has become a viral TikTok trend in 2025, meaning someone confidently asserts expertise in a niche skill, such as weight loss, makeup, crafting, or mewing, not related to basketball. Users share videos using a split-screen format—starting with a standard image or clip, then showing proof of their skill—ending with "Trust me, I know ball." The trend gained momentum with the "plug walk remix" audio, used in over 600,000 videos, many going viral. Celebrities like Jordan Fisher have joined, highlighting past roles to demonstrate credibility. The format celebrates personal mastery and confidence in online spaces.