I can't think of any specific words that I overuse (there are doubtless plenty and I just don't notice) but I find myself in mid personal catchphrase sometimes and want to rip my tongue out and stamp on it.
(As someone who regularly signs the name identical to the left hand column i am dying of chagrin that my words are but farts to haus, but yet i can't seem to stop it. Is there a Signers Anonymous group?