Top Definition
to either masturbate or have an orgasm so intense it makes you go temporarily blind. The name is based off of a 9th century Italian king who plotted against Emperor Louis the Pious. Having been caught, he was punished by being forcefully blinded.
"Oh my god I was fooling around with a guy in bed and he King Bernard me for a whole hour."
by Entorwellian September 15, 2009

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