Shotgun = Firing all your hull guns (usually 2.0 Class 9 Guns or 2.0 Codenames) and MR at the same time causing massive damage if you hit your opponent. If you fly a Very Heavy Fighter and mount to maximum hull-damage firepower you can instakill any ship below the armour of an Eagle.
Sliding = Using a combination of engine-killing and thrusters to circle the opponent and firing at him/her at the same time.
Mine-Ramming = Ramming into an opponent with your ship and quickly fire a mine, if successful the opponent will take a mine-hit but you are prone to get hit yourself.