noun. A fuckwit acquired by the holy sacrament of marriage.
Real citation: “I am shattered. I am also likely to be locked up, because my fuckwit in law pommy rang me to gloat, I threatened to rip his pommy head off and drop a shit in the stump.”
(Aug. 7, 2005, After Grog Blog, http://aftergrogblog.blogs.com/agb/2005/08/a_close_runs_th.html)
Made-up citation: “Through annulment, I lost a treacherous spouse, a lecherous fuckwit-in-law, a preposterous poodle-in-law, and an adorable nanomajig-in-law, who left a tiny hole in my heart and petri dish.”