How about the community throw out some ideas to best describe the 'start of the game'
Im going to run with' Throw Down '
I have been known to make players flinch with my Asteroid placement.
Thats before they've even seen me deploy!
New term for the 'Start of the Game'
(Hyperspace) 'Jump in'
Opening Ceremonies
Gink Time
My experience indicates that the most common term for getting underway is, "Well...****."
I agree with Deathseed.
Let the models see the dice....
Now witness the firepower of this fully armed and operational battle fleet!
(Speaking to your ships) Fire at will, commander.
Jump In (seconded)
Come at me bro...
Hammer time......
Wait a minute .........
It's a trap!
Foreplay 
Time just before I run over my own fighters.