Used when some one has been slaking off to explain what else they could have been doing. Synonym for procrastinating. Comes from "The Crucible" by arthur miller where John Proctor is accused of plowing on sunday.
Example 1:
P1: "Dude i spent all night watching tv instead of doing my english home work."
P2:"Idiot you might as well have been plowing on sunday"
Example 2:
P1: "Wanna hang out tomorrow?"
P2: "I might as well plow on sunday."
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