It’s an adverb that can be used in a number of different ways:
1 It can mean particularly savage and violent;
2 It can mean in a direct and uncompromising way, where no attempt is made to disguise unpleasantness;
3 It can mean to an extremely unpleasant or harsh degree;
1 He was brutally attacked in the street;
2 It was a brutally candid review of her performance;
3 The thaw followed weeks of brutally cold weather;
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N. v. a cuddle between two men of deep comraderie, or "brothers". Originally stemming from "bro-cuddle", the contraction was considered even manlier than the aforemention term, and therefore usurped its place at frat house mixers and tailgate parties alike.
Chad wasn't so much sore from last night's impromptufootball game as he was from the celebratory bruddling that followed.
One bruddle later, Nathan knew he had finally found a home in the fire station.