fit to kill
To an extreme, excessive, or lavish degree. I'm sure she had a great time at the gala—she was dolled up fit to kill when she left here.
fit to kill
Rur. a great deal; to the highest possible degree. We laughed fit to kill when we saw the expression on Jim's face. I had my car gussied up fit to kill.
fit to kill
Excessively, immoderately, as in She was dressed up fit to kill. [Colloquial; mid-1800s] Also see dressed to kill.
fit to kill
Slang To an extreme or elaborate degree: dressed up fit to kill.