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1.
Sitting on the sofa on a Sunday watching football, drinking beers and eating nachos and buffalo wings.
Wife: Can you go out and do some errands?

Man: No babe it is sofa Sunday I will later.
by pizzadue November 30, 2012
 
2.
'Sofa Sunday' is the day or days when most people shop for the holiday gifts using their tablets.
What a sofa sunday! (I got many of my gifts for the holidays purchased from the convenience of my home, using my tablet)
by catalog_fan December 05, 2011