1 definition by cones90

Top Definition
The world's most powerful laxative.
"Dude, I drank a 12 pack of Keystone Light this weekend and had the shits for 3 days."

"Who needs Exlax when you can just drink Keystone Light? Plus it is cheaper."
by cones90 September 27, 2009

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Buy a Keystone Light mug!