The supposed amount of time (5 seconds)you have to pick up food after it's been dropped on the ground or floor. Allegedly, the bacteria doesn't get on it before 5 seconds is up so you can still eat it if you pick it up really quickly. Sadly, it's all bullshit and not true but it makes good for justification - mainly so people don't call you gross.
*drops an ice lolly*
"FIVE SECOND RULE!"
*picks it up, brushes it off, sticks in mouth*
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