A phrase combining the common term 'moderately', meaning somewhat and 'dec' an abbreviation of the word decent. The phrase itself means something that is between "decent" and "somewhat decent." Can be expressed by simply saying 'dec-dec.'
Hey man, that class is dec to moderately dec.
That girl over there is moderately dec.
I am dec to dec-dec at basketball.
1. Square root of 12 is 4
2. Wut!? No mun, you mean di square root of 16 is 4?
1. Sorry, I is a dec-dec