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5 second rule 

A socially accepted rule that states a piece of food or edible meterial can safely be eaten if it is dropped on the ground for no more than five seconds.
The kitchen procedures (modified 60 second rule) of the San Remo Hotel in Las Vegas, NV.
5 second rule by Sn00p July 10, 2004

5 Second Rule 

A myth that says that if you drop food on the floor, and pick it up within 5 seconds then it's okay to eat. But research done at University of Illinois has disproved this, and says that food picked up in under 5 seconds had a significant amount of bacteria on it.
"Ewwwww! Your gonna eat that? It's been on the floor!!" "Yeah, 5 second rule."
5 Second Rule by JoeB24 May 27, 2007

inverse 5-second rule 

When you pick up something interesting on the ground and you hold it for less than 5 seconds, it is ok to put it back on the ground.
jim: dude didn't you pick that off the ground?
tom: ya.
jim: then why are you putting it back on the ground? you should just put it in the trash.
tom: nah dude. inverse 5-second rule.
inverse 5-second rule by dtix July 30, 2010

2 second rule 

Used in restaurant kitchens in terms of food dropped on the floor, if it is ownly on the floor for a loose "2 SC" it's still ok to serve to the guest.
"Holy shit, did you see me drop that steak?"
"Your good, ya got it within the 2 second rule."
2 second rule by chef t July 31, 2006

extendable second rule 

Similar to 3 second rule, 5 second rule, 10 second rule

An (as of yet) unwritten rule that any food dropped on the floor may be picked up and eaten as long the person who dropped it states the number of seconds it has been on the floor and adds 'rule' on the end.

This is ever extendable for the length of time the food has been on the floor so can be used in any situation, especially if the dropped item is not easily accessible.

It is commonplace to wipe off some of the dust etc. before proceeding to eat
Person 1: Oh no I dropped my sweet under the table!
Person 2: No worries 25 second rule
Person 1: I thought that was just 3 seconds
Person 2: no it's the extendable second rule

*person 1 bends under table, retrieves sweet and eats it*

5 second rule 

A highly scientific finding that says that germs need at least five seconds to jump on food that falls on the floor, enabling the person who dropped said food to pick it up and safely consume it, as long as they do so within five seconds of dropping it.
"Hey dude, that cookie's still OK to eat, the five second rule's in effect."
5 second rule by dungbeetle July 10, 2004