A roast in which someone defends them self factually, proving one wrong with evidence and intellect. Often times this can be achieved in a serious and defensive manner, not always having to be humorous or funny.
Person 1: "Huh, you just said your queer! That means your gay!"
Person 2: "Actually my dear friend, i meant it in the traditional manner, that being strange and unusual"
Person 1: "wow, that's quite the factual roast"