When an agreement between two parties is broken at the last minute, usually to the advantage of one at the expense of the other. This could be for personal or financial reasons. Most notably used in college football, but can be (and is encouraged to be) applied to other sports and situations. The origin of this term is the word Furman, as in Furman University, and its actions regarding the University of Delaware and the University of Missouri.
Furman: Ok…*signs contract*
*Missouri throws money at Furman*
Furman: Hey Delaware…about that contract…
Delaware: WTF! I just got Furmaned.
Pastor: If anyone has reason for these two not be wed, speak now.
*Ex-boyfriend shows up on motorcycle*
Future Wife: Yeah, um….*runs out of church*
Husband: What the…
Pastor: I’m sorry my child, but you have just been Furmaned.