A transit is an event in which the planet moves directly between the earth and the sun. This means if you look at the sun (with a special filter as to not blind yourself), you can see the planet move across the surface of the sun. This type of event is much rarer than a meteor shower.
If your relationship is headed off the rails right now and your sig other is driving you crazy, give it two weeks and you could see a complete transformation. There's a reason for the madness, and it will go away soon.