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."
作者 p14nd4 2004年7月11日
the belief that if one picks up food quickly after they drop it it is still good.
He choose to follow the 5-second rule despite the dubious way in which the floor was cleaned.
作者 The Return of Light Joker 2008年1月07日
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."
作者 dungbeetle 2004年7月10日
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!!
作者 I r mime 2007年5月13日
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
作者 mr. fluffy penguin man 2011年2月23日
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."
作者 Sabrina O'Henry 2007年5月06日
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!
作者 Auto_Insurance 2004年7月10日

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