The 5 second rule is used to suggest that food that has fallen on the ground/floor is still fine to eat, as long as it has only been there 5 seconds or less.

Commonly the rule is simply extended to however many seconds is necessary to declare the food still edible (ex: 20-second rule).
"Aww crap, I dropped my hot dog on the ground." "It's alright: 5 second rule."
by p14nd4 July 11, 2004
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A widely known rule used to make morons feel better about eating off of the ground. Supposedly the food god protects all food for 5 seconds after it touches the ground. After which the food god will become angry and infest it with cooties.
Moron: Oh noes my sammich!
Food god: Hurry, pick it up. 5 second rule!
~5 seconds later~
Moron: ...What?
Food god: I am angered! I shall infest your sandwich with cooties!!
by I r mime May 14, 2007
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Contrary to the belief, it is actually 5 seconds from when you see the food that you may consume it without it being dirty or at all harmful to your body because, come on, it's only been five seconds.
"Sweet! A cheeto!"
"Dude, that's been there for 3 days."
"But I just saw it, like, 3 seconds ago. 5 second rule yo."
by Sabrina O'Henry May 6, 2007
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Informal:

A popular axiom that deems food dropped onto the groud edible for a period of 5 seconds immediately following its release. Does not apply to porous or otherwise absorptive foods such as frosted cake or ice cream.
-No! Don't eat that!
-Nah, it's O.K. Five second rule!
by Auto_Insurance July 10, 2004
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an excuse to eat food off the floor.
Eric: *walking along, sees a piece of candy on the ground* NOM
Jason: Dude...
Eric: 5 SECOND RULE
by mr. fluffy penguin man February 24, 2011
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An informal notion that food dropped onto the ground is still edible if retrieved within a five second time frame. Variations exist; 30-second rule, 2-minute rule, et cetera.
Damn, that was the last potato chip. Oh well, 5 second rule in effect, right?
by kinsmed July 10, 2004
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if you drop a piece of food on the ground (most likely, something that you've taken a long time to prepare, at a time of crisis right before this needs to be served, or after a long day), you have 5 seconds to pick it up and it will be fine. While it still has germs, these 3 words just may give you peace of mind.
Crap! I just dropped the souffle I've been working on for 3 hours! And Jackie is getting here in 5 minutes! *picks it up* 5 second rule will have to do I guess.
by Meg July 10, 2004
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