Def.: Exactly as it sounds, but as it is a proper noun it refers to the Lonely Island song humorously to describe a Sunday spent doing very little but nomming on snacks and watching a lot of film/television/whatever you wanna watch with your pals.
Usage: Yeah, all the highlights of today were lazing around, four hours of The Sopranos followed by one of True Blood and two of Castle, and fresh strawberries and cream in a waffle-cone bowl, it was a definite Lazy Sunday.
–your fangirl heroine.
partlydrawn 