Adj. - An object, activity, person, place, or idea that reminds one of the feeling gotten come Sunday morning, when the realization that the next day will bring hell AND high water (i.e., work, school, obligations, sobriety) sets in.

(Reminiscent of a wet, reeking dog lying on your clean clothes/bed/couch/person in the dead heat of a Mississippi summer day, happily permeating all surroundings in its stench and spittiness.)
"Dude, that essay is Sunday Thing, to the max."

"So you've got testicular cancer, eh? Sunday Thing, man. Sunday Thing."

"That bitch had the most rotten knot I've ever smashed! It was some kind of Sunday Thing, for serious."
by Bolognaise July 19, 2008
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