Radioactive Slap in SAB Roblox appears to be very rare : one public wiki source says it comes from the Radioactive Wheel with a 0.5% chance , which is about 1 in 200 spins.

Quick Scoop

  • Reported rarity: 0.5% chance.
  • Rough odds: about 1 in 200.
  • How it’s obtained: by spinning the Radioactive Wheel during the Radioactive event.

What that means

That kind of drop rate is low enough that many players can spin quite a bit without seeing it, so it’s usually treated as a collector-level rare item.

Note on sources

Some short-form posts also describe it as ultra-rare, but the clearest numeric source available here is the wiki entry listing the 0.5% rate.

TL;DR: Radioactive Slap is around 0.5% rare , so it’s very rare in SAB Roblox.