That's "You're already dead." Very very butchered, though.

So many otaku captains here...

"Ore, sanjou!" - When making a Big Damn Heroes' entry screaming out of Full Impulse to save an optional. :p

"Atatatatatata!" - Cannon Rapid Fire

"Hen...shin!" - Transforming the Chimera

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That said, I haven't exactly a 'catch phrase'. Things like ordering my coffee/tea from a replicator, straightening my shirt before starting an STF, and having team chat buttons on hot key are more my kind of thing.

If there's something that I say often, its reading off all my tac buff skills as I hit them, ending with Fire On My Mark, then "WAVE MOTION SPINAL LANCE, MARK!"

The 'Minister of Finance' always gives me weird looks when I'm playing STO.