flake out

verb3

1. •
   (informal) To fall asleep from exhaustion or intoxication; to lie down.
2. •
   (informal) To flake or be flaky: to prove unreliable; to abandon or desert someone.

   • John said he could drive me to the airport, but then he flaked out on me, and I had to call a cab at the last minute.
3. •
   (slang) To crack up or break down; to have a mental episode; to behave eccentrically.