Risa

I'd put on my tiny shorts and stand in front of the view screen waving a chequered flag.

Fire up the Quattro!

Switch to secret hyperjets!

Fucking go already you fucking fuck!

I've always been a fan of "Make it Go"

But I think I'd prefer what someone else here said "don't wait for my order, just move when we're ready."

I know I'm beign a sourpuss, but I hate how much of a thing modern Trek has made this.

That's it. I'd say that every time.

Allons-Y!

I think it's pronounced, " e-yeaw ".
The sound a wagoneer makes to get the horses going on a chuck wagon.

I would install drag strip start light aka Christmas Tree on the bridge.

It would use the sounds from Atari 2600 Pole Position.

The countdown starts when I say

'Computer, assume the position.'

I wouldn't have one.

It honestly always seemed silly to me. Unless I told the helmsman to wait for some reason, they should just go as soon as they're ready. Why wait an extra moment just for me to say "go"?

That said, if it was some kind of required protocall, I'd pick a different silly term each time. Like "Banana Bread", "Pencil", or "Fuck off".

Pull my finger

Smoke it (then I light a blunt)

Retreat!

Lets go!

"Let's mosey"

"Let's throw some coal in the boiler"

"Slap her fanny and make her jump"

"Suck it, physics!"

Everyone start making 'vroom-vroom' noises!

"Let's Boogie, my dudes"

Crank it to 11.

If I'm feeling jinky I might go with Let's get out of here Scoob.

¡Ándele, pendejos!

Crank it

"Begin!"

"Today, helm" would be fun every time there was someone new

Starboat go brrrrrrrr

Make like a tree!

Chooch it!