I have a few (some of them swear words, c**t, in particular).
FiL says "Jesus Wept" quite a lot, hate that too.
One particularly annoying one though, is from my Dad. "Coppish". It is a word that describes the bit in a man's underpants that would accommodate the penis. 
I have a DP and DS, and when I hang their pants on the washing line, the stupid word is like a brainworm. I want it expunged - it is the most annoying thing in the whole world. I've never ever heard anyone else ever say it. Ever! And it drives me potty.