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Hash Collision

/hash kə-ˈli-zhən/

[from the technical usage]

n. (var. 'hash clash') When used of people, signifies a confusion in associative memory or imagination, especially a persistent one (see thinko).

True story: One of us [ESR] was once on the phone with a friend about to move out to Berkeley. When asked what he expected Berkeley to be like, the friend replied:

"Well, I have this mental picture of naked women throwing Molotov cocktails, but I think that's just a collision in my hash tables."

Compare hash bucket.