What is the easiest way to 'Goose' in Titanfall

The easiest way is to be in a titan - titan weapons kill pilots fast.

That is, if you can hit them mid-air. Personally I find the Arc Cannon (without capacitor) the best, but some players prefer the Chaingun.

Alternatively you can rodeo a titan - when the pilot ejects you will eject with him. If you got for this method, you'll probably want the Smart Pistol, RC-101 or an SMG to win the duel.

I am an old guy and could not to date master the gooser challenge. I have completed the challenge and then some but never shot a single pilot. I can effectively beat down a titan and get an airborne kill when the pilot ejects. If he does not eject then it becomes an execution. I can now get 2 goosers out of 3 titan beat downs. Works for an old guy like me that cannot track air borne pilots with a weapon. Hope this helps others.

I use the krabar often because when they eject, you can track them and with the right timing you can get the kill. Tip: Aim below the pilot but not too far, then pull the trigger. If you are not good with a sniper, use a smart pistol. Good luck and happy hunting.