A Benedict cumberbald is where during intercourse you shave your partners head and rub horse semen on their head while simultaneously putting a lava lamp all the way up your rectum
Me and Larry had a Benedict cumberbald last week, it felt great.
Someone who betrays everything they stand for seemingly out of the blue. Generally used in a political context.
Originated from the realBenedictArnold, an American general in the Revolutionary War who famously betrayed America.
Dude 1: did you hear about biden changing his opinion about gay marriage
Dude 2: that was decades ago faggot
Dude 1: He's still a dirty benedict arnold.