Okay, real answer:
I often tend to say very Kermit-like "Oh good"
Aside from that and other odd Muppet quotes, a lot of my catchphrases tend to be fave lines from my fave obscure songs:
"Prima amore - WOW!" (Eurythmics, Wide Eyed Girl)
"Swelligant" (Debbie Harry/Iggy Pop, Well Did Ya...