The phrase that drives me crazy, and no one else as far as I can tell, is "behind my back". As in "Why did you buy that 200 dollar shaving brush 'behind my back?'"
How do you do anything behind a back? It only has one side and that's the front. The saying just makes no sense. It would actually make sense to say "When did you sneak the 7 jars of Martin de Candre soaps into the house 'in front of my back?'"
And, wit' all doo respekt, no one on this board is taking the F word away from me. Over used? yes. Inappropriately used? Absolutely. Vulgar as well as imprecise? Just as you say. It is also indispensable with the exact right amount of mouth feel required for an expletive. If what we think of as dirty words were classified the way french wines are classified, then F*k would be a first growth. (I'm thinking Latour.) There is little else in the English language so expressive and irreplaceable as this word used properly.
Important caveat: I have never used it in front of my mother who can still generate enough leverage up from her calfs, through her replacement hip and out a distinguished right cross to send me down for the count of ten. Not a word she would ever countenance.
The Definition of a Gentleman: Someone who is never rude, except on purpose.