I don't think I've ever had a particular quote that I'd call my own catchphrase.
Although if you pay attention to the people around you, you'll notice that they all have their own catchphrases or strings of dialogue they'll repeat in the same situation. My best examples all come from people I've worked with.
My trainer had: "Don't be a nosy parker." for anyone who was being nosy. I think they also had a few more, but I can't remember them right now.
One associate had: "Is there overtime available?" used at pretty much every lunch start-up.
Another shouted out: "Yeah!" extremely loudly as his after meeting cheer. I compared this habit to Snowflake/Bulk Biceps similar exclamations and he stopped doing it for a while, sadly.
I myself tend to use "Heyo!" as a greeting and scream out "Muda! Muda! Muda! Muda!" in any video game where you can rapid-fire punch as an attack. Time stop attacks get an Engrish cry of "Za Worldo!", but these are all burrowed from different media sources. I've even picked up a habit of flicking my wrist from a certain show as I find it hard to remain still for long periods of time.