The "OnlyBass" style typically strips or significantly muffles the vocals and melody, leaving only the percussive bassline and sub-tones to test speaker excursion and "flex."
The Original Version is available via Bdlp Music on YouTube and other streaming platforms.
High-frequency elements are often rolled off to emphasize low-end frequencies (20Hz–80Hz).
The version you're referring to is a specific audio modification designed for listeners with high-end subwoofers or car audio systems: