From Longman Dictionary of Contemporary Englishflake out phrasal verb informal1 SLEEP British English to fall asleep because you are extremely tired Phil’s flaked out on the sofa.2 American English to do something strange, or to not do what you said you would do on Kathy said she’d help but she flaked out on us. → flake→ See Verb table
Examples from the Corpus
flake on• He'd flaked out on my bed. 