A keg that has been tapped for atleast a week.
"Dude this zambie yeg tastes like shit"

"Bro were running out of beeh, bust out the zambie yeg from last weekend and feed it to those fuckin zambies"

"We got 2 new kegs and 1 zambie yeg from last weekend"

"When the clock strikes 2 am bust out the zambie yeg and feed it the freshman"
by KEGGOD22 November 3, 2009
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