bless someone's heart

phrase4

1. •
   Used to express affection.

   • Bless his innocent heart, he looks too sweet for anything in his little short dresses, with his dear feet sticking out. — 1917
2. •
   (Southern-US) Used to soften criticism or express pity. (Compare the British usage of bless (expression of endearment or belittlement).)

   • My dog can't fit in her puppy bed anymore, but she still tries, bless her heart.
   • They're having a hard time getting used to the food down here. They don't like grits — bless their hearts, they don't even like sweet tea.
3. •
   (Southern-US) Used sarcastically to express contempt.
4. •
   Used to express gratitude. (Compare bless you, God bless you.)