Can God create a rock he can't lift? The answer may surprise you!

No apologies for the title. I'm idiotically enamored of clickbait taglines.
So, here's the thing. We've all heard the above question. Hell, we've probably even uttered it aloud at some point in our journey. But I actually started to think about it (like, REALLY think about it) today, and I realized that there is a definitive, logically-consistent answer to the question! I think. I mean, if anyone wants to pick apart what I'm about to lay down, then you're absolutely welcome to!
It kicks off with two premises, and they should be pretty easy to accept in the context of this thought experiment:
1.) God is what I like to call "Far Side God." He's an old guy with a big white beard and a toga and magical powers. I think this is what most people default to when they think of God, so it shouldn't be an issue. Swap genders and insert your ethnicity of choice if you like. Doesn't matter as long as we've got our anthropomorphic sky wizard in play here.
2.) An inertial frame of reference is necessary for any discussion of motion. Shouldn't be an issue accepting this premise, since all of Newtonian physics is based on it.
ON TO THE FUN PART!
So God hears some newbie atheist ask the rock-question for the umpteen-millionth time, and he's all like, "You know what, dammit, I'm going to settle this once and for all!" So he gathers some matter together, smushes it into a rock, and gives it a heft. No real surprise, he can lift it. He reaches out, scoops up some more matter and squidges it into the ever-expanding rock. Can he still lift it? Yep. Anyway, this continues, iteration by iteration, until he has finally gathered every speck of matter in the universe. It's just God and the rock. He rolls up his toga sleeves, grasps the rock and suddenly realizes, to his dismay, that without an inertial frame of reference, he can't tell whether he's lifting the rock or sliding himself under it! Either interpretation is equally valid.
So. Can God create a rock so big that even he can't lift it?
Looks like the answer is yes.