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1. To cancel a prearranged meeting or event, especially at the last minute; to fail to attend or go through with something. I'm going to stop inviting Samantha to do stuff with me because she always ends up flaking out. I hate to flake out on them again, but I'm just too tired to go out tonight.
2. To collapse or faint from exhaustion or fatigue. After the eighth or ninth hour wandering in the woods, George eventually flaked out under a tree.
3. To go, or cause to go, crazy. I don't know what happened! I just mentioned that her father had called, and she started flaking out at me! His huge, arduous assignments are really starting to flake his students out.
4. To fall asleep or take a nap. I think I'm going to head home at lunch and flake out for a bit.
5. To lose one's confidence, courage, or resolve. I really need your help in this fight, please don't flake out on me now!
1. mod. alcohol intoxicated. You are too flaked out to drive home. Give me your keys.
2. and flaked mod. passed out because of drugs. (Drugs.) Jerry took the stuff and ended up flaked.
3. mod. unconscious; exhausted; tired out. There are too many flaked out people working at dangerous machines.