Athreed Share definition Flag Combination of agreed and three. Used when three people agree on something. More specifically, the third person to agree on a certain topic or idea will use this word. Richard: I think we can all agree that we shouldn't talk about this.Tom: Agreed.Sam: Athreed. Athreed by KWBEAST September 26, 2009 0 0 Get merch Get the Athreed mug. Buy Now — $32.95 See more merch