Helluva bump, but while it's up I might as well add mine. Note that I use Ganon and my roommate uses Fox.
Sometimes when I don't make it back to the edge, especially after the up-B leap of faith, I call out "Noooo, my emperor!" (Obscure SF64 reference: "My emperor, I've failed youuu!"). Occasionally when I'm sent flying across the stage but not KO'd, I'll imitate Mario in SMS when he's shot out of a cannon: "Ooweeeeeeeeehee-hee-hee-hee-hee!" Also when I keep coming back to the stage at high %, I start singing "I Will Survive"; one time my roommate played the song during our match too.
He's picked up Samus and he got a kick out of Wes's "Extender-r-r!" so he says that every once in a while. It's not one of our sayings; I just crack up remembering those matches in EC vs WC. Wes is my hero X)
Oh yeah, when I play as Link for whatever reason (I freakin' suck with him) and a shorthop doesn't register: "Jump, Link! Jump like a white boy!" And several years ago with an entirely different group, I was playing as DK in FFAs. I KOd with the windup punch (we called it Donkey Punch) and said "Welcome to Donkey Kong Airways. This is a non-stop flight... to the edge of the screen."