Top Definition
When two people (usually best friends) smoke so much bud with each other.
Christian: Yo I think Nov' and I have smoked so much together that we've become bud brothers. Jeff: Have you mixed your weed with him yet? Christian: Well, yea but isn't that blood brothers? Jeff: Oh yea, that's right. Christian: You silly vermin.
by The Marvelous Christian (TMC) October 04, 2009

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