When one accidently drops food, not held in a container or wrapper, on the ground. The rule states that if you pick it up within 5 seconds, it won't be contaminated. There is also a '10 second rule' variation. Unfortunately, both rules are urban legends -- The speed with which you can pick the food article back up has no bearing on whether it may receive germs.
Person A: "Crap, dropped a cookie."
Person B: "5 second rule!!"
Person A scrambles to pick up food article
Person B: "5 second rule!!"
Person A scrambles to pick up food article
by Ryan Thompson July 09, 2004

A unspoken rule where if any sort of food falls to the ground, if you pick it back up in 5 seconds or less it is still okay to eat.
by Nathan Charette July 10, 2004

by Erin July 10, 2004

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.
by Nadia July 09, 2004

when food falls to the ground from your mouth/hand/counter/etc if its down for less than 5 seconds its still okay to eat any longer and it is trash
I was eating my cookie,tripped,dropped it on the floor,but it was down for a second,and was still eatable.
by Iceey Baby July 10, 2004

Any food that has fallen on the ground is allowed a maximum of 5 seconds before it is left as trash.
Well...I picked up this banana before it was on the ground for longer than 5 seconds. That's the 5 second rule.
by Joel July 09, 2004

A long standing rule in which any food which is dropped on the floor/ground is still "good" and edible if it was only in contact with the surface for less than 5 seconds. Incorporated mainly by clumsy children but is often used by teenagers and adults as well.
"Dude, this hotdog is awesome....damn, I dropped it on the ground. No big deal, its still good takes a big bite, 5 second rule!! mumbles with mouth full"
by zebo2k July 11, 2004
