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1.
Second day stubble, particularly in the pubic region.
(inspired by the actual term "day olds", referring to donuts/pastries baked on the previous day which are offered at extreme discount prices at Robin's Donuts and Tim Horton's)
"I don't mind that I didn't meet anyone worth hooking up with tonight; I've got day-olds anyway"
by x_MissPink_x January 11, 2009
 
2.
is when a person did not clean there self the day before and you can smell ass all over them
when jim past by he smelled a dayold
by mickbizzel August 17, 2009