Mastodawn

"Ladies and gentlemen."
- Tired
- Binary
- Exclusionary

"Gentles all!"
- Shakespearean
- Inclusive
- Hard to argue with

"Yo, fuckups!"
- Even more inclusive
- Attention-grabbing
- Far too accurate

Personally, I like:

'Oi, you lot!'

Then again, I do live in England;-)

@AspiringLuddite
It's a shame that never caught on in the States because it's a great one.