An adverb, meaning "a lot" but it can be used in other contexts aswell. Cannot really describe it well but check out the examples and you should get it.
I'm sweating like a beaver.
My hand is itching like a beaver.
I've been running like a beaver.
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Short for D.W. which is short for Don't Worry which is short for Do not worry.
In other words 'Dee' is an abbrieviation of 'Don't Worry'
Person 1: Did you hear that I'm going to die?
Person 2: Dee
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