The phrase "happiest version" means the best and most joyful situation or state of being.
Sentences with «happiest version»
I won't say that this is the best version of me, but I will say that this is a really happy version of me. (theadoredlife.com)
I love this dress — both the original and your perfectly happy version — I can imagine never taking it off through a long summer! (acolourfulcanvas.com)
* Ahem * If I were a less dark and infinitely more happy version of the betting man, my money would be on Media Molecule or Polyphony Digital to lift the curtain on their secret PS4 creations. (shortpause.com)