Successfully landed this a few times in training. The first person to land it in actual competitive play deserves a trophy.
Delayed B, jump-in A (as far away as possible while still connecting), f.A (again, as far as possible and hitting with just the fingers) xx「THE WORLD」, n.A (delayed Geigear hits), n.A xx Timekick
There should definitely be an achievement in-game for landing a 5 damage combo with Geiger, though. Should make a list of fun character-based achievements, come to think of it.