I fail to get it. Is the equation about equilibrium energy and temperature flow or something?

At first I was confused by kT (looks like thermodynamics), but G and \lambda are from general relativity.

It is Einstein field equation (http://en.wikipedia.org/wiki/Einstein_field_equations). Also in http://en.wikipedia.org/wiki/Solutions_of_the_Einstein_field_equations it is presented in same form as in image.

I still don't get the meaning (sorry, I have a shallow knowledge of general relativity). Literally "You are the Einstein tensor in my Einstein equation". Maybe, "You are the solution in my equation"?

Let's see...
If G = "universal gravitational constant"
[http://en.wikipedia.org/wiki/Gravitational_constant],
and "a solution of the Einstein field equation" = spacetime,
then "you are the G in my spacetime"
could mean "you are the one I'm attracted to",
aka "I love you", I guess?