A pre-fiancé (or pre-fiancée), generally the result of a long-term relationship assumed by all to be headed for eventual engagement; the designation one step above boyfriend (or girlfriend), but a notch below fiancé (or fiancée).
After he agreed six years into their relationship that someday he would indeed propose to her, Karen began referring to Craig as her preancé to indicate they weren't just dating aimlessly.
by EEKatLarge February 14, 2009