I thought I understood it,

 that I could grasp it. 

But I didn't, not really. 

Only the smudgeness of it;

 the pink-slippered, all-containered, 

semi-precious eagerness of it.

 I didn't realize it would sometimes be more than whole,

 that the wholeness was a rather luxurious idea. 

Because it's the halves that halve you in half. 

I didn't know, don't know, about the in-between bits;

 the gory bits of you, and the gory bits of me.