From The Art and Popular Culture Encyclopedia
Ipso facto is a Latin phrase, directly translated as by the deed itself, which means that a certain effect is a direct consequence of the action in question, instead of being brought about by a subsequent action such as the verdict of a tribunal. It is a term of art used in philosophy, law and science.
Aside from its technical uses, it occurs frequently in literature, particularly in scholarly addenda: e.g., "Faustus had signed his life away, and was, ipso facto, incapable of repentance." (re: Marlowe, The Tragical History of Dr. Faustus.) or "These predudices are rooted in the idea that every tramp, ipso facto, is a blackguard" (re: George Orwell, Down and Out in Paris and London).