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A way to politely describe something that has gone horribly wrong. It's also when something has gone nuts AND is a clusterfuck.
me: Sorry mom. Some servers went clusternuts and I have to stay late at work
by funky49 April 23, 2009
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When pulling out in a threesome, one accidentally nuts into both other participants eyes.
"Man, last night I was with Steve and Jessica and It was a real clusternut"
by Gillesdelatourette December 09, 2018
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