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Internet slang version of "fuck off". derived from "Hack and crack off". Used also as a threat to hack (or crack, if speaking in the hacker's slang) one's computer.
sometimes also used in other forms instead of the "fuck" word, like "STH&CU" instead of "STFU"
-Hello, please tell me your birthdate and social number.
-Oh man, H&C off!
by Seeder August 28, 2007
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