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A day so big that it encompasses the activites and labour of an entire week. It is generally begun early in the morning followed by bad weather and lack of equipment and supplies.
Coady: We ran out of garbage bags.

Ed: And so the big day comes to an end
by foug June 13, 2003
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When you wake up and instantly feel big. During the day you can feel in the way and destructive and things often get in your way. The opposite can be a small day when you feel small and pathetic.
Brian woke up and hit his head on the door. Later on while eating his breakfast he noticed the spoon for his breakfast felt small, either the spoon was having small day of he was having a BIG DAY.
by Jakenyo July 21, 2016
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