Now you're on the trolley....
Slang changes constantly. I started hearing this probably 6 or 7 years ago, which means that the hipsters were using it 10 years ago. The keg analogy seems logical, but I know enough about slang not to count on it.
Stay cool, daddio.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." - B. Franklin
"There ought to be limits to freedom." - George W. Bush
"We have met the enemy and he is us." - Pogo
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