Wasband
Wasband = ex-husband. I just saw that on a discussion site.
Herb Caen, in _The San Francisco Chronicle_ (March 12, 1990), wrote:
After reading here about the guy who calls his wife's ex her "wasband," Rosemary Wolohan confides that she refers to her two exes as "hasbeends."
I still have my first husband, but I'll try to remember those terms for future use.