The Y2K drum sound is a fusion of several styles that dominated the charts at the turn of the millennium:
Ultra-clean, quantized beats found in early Britney Spears or NSYNC tracks.
Sharp, metallic hi-hats with lots of sizzle, often arranged in complex, syncopated patterns.
High-pitched, "cracky" snares. Think of the crisp, tight snares used by producers like Pharrell Williams and The Neptunes or Timbaland.
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High-tempo, breakbeat-focused drums that influenced modern "Y2K revival" artists like PinkPantheress .
Short, punchy, and "boxy" kicks rather than the deep, sub-heavy 808s common today.