curl up and die
To die. This phrase is usually used hyperbolically or humorously to emphasize one's embarrassment. If I don't get asked to the prom, I'll be so embarrassed that I might as well just curl up and die!
curl up and die
Fig. to die. (Often jocular.) When I heard you say that, I could have curled up and died. No, it wasn't an illness. She just curled up and died.