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To screw up really badly. As in a way that makes regular mess-up's look like peasants in comparison to the royal proportions of this particular mess-up.
Bro: how was your date last night?
King: Yeah, the date was going fine until I got in my car to leave and messed up royally.
Bro: what happened?
King: Well, I backed over her cat in the driveway... and then made a joke about it.
Bro: whatever, cats suck.
by Moe Cyslac November 28, 2013
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