I am waaaaaay late on this thread - but I've been poking through the archives, and have found some gems!
So, for the record, two words immediately came to mind, for me:
Cop (for police): *Especially* detest it when used in a news report!
Crap: I cannot believe how it's become an acceptable term for everyday interaction - as in "this new computer program is crap" or "the weather is crappy". Horrible.
... and speaking of the weather - this third one just came to mind. I *really* find it crass:
Dump: when referring to snow. As in "We're expecting a big dump tomorrow." Gahhhh!
... back to the archives ...