I got many catchphrases ._. One of them is saying "Zup?" and also saying "Fudge" instead of the f-word... so you would hear me say "fudge" many times in real life XD!! (sometimes I go like the brother in Little Miss Sunshine ._. ... XD)
Also, I like saying some words or phrases in japanese, like "hai", "domo arigato", etc. When I get too excited, and something goes my way, I yell "OHH YEAH!!" or "AAALRIGHT!!" ^^;; Just to make fun out of nothing at all, or when something happens and everyone around notices the event I say "It wasn't me" in a slow, really-sorry voice, and I tilt my head a bit to add some spice to it. When I say in a cheerful manner to someone to follow me and they are like "... what?" I say to them a la Link of Wind Waker "c'mon!"
Oh, and since I'm addicted to House, M.D., I say many phrases of his, or get really honest, or say stuff that sounds really honest and not-so-caring like "... Yea, whatever". I'll say "... um, o-okay" when someone says something really weird. From a really neat game called Psychonauts, I tend to respond to someone with "Okaayyy, creepy maaan." Also (I take many catchphrases from many things ._. ) form Solaris, "Yeaaa..." and that's it.. yea is all there is.