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One's non-erect penis with an excessively large amount of foreskin that you could potentially pull forward and tie the end making it look like a solid tube of liverworst. Possibly the most disgusting thing to call a man with an un-circumsized john-thomas.
"Vinnie, shut the fuck up. You're nothing but a livercock."

"Eww, you haven't had your pencil shaved? Haha you're a livercock!"
by Brandon Wheeler July 20, 2008
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