One of those grey, dull, boring days where you don't want to do anything but don't want to do nothing. Sometimes rainy or cold. Mostly it's associated with the feeling rather than the weather it's self, but can refer to both.
1. I hate when it's this daygloomy out.

2. Shit, i'm feeling all daygloomy.
by Dalekman March 29, 2010
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