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Verb: To cancel previously agreed upon plans last minute, or simply not show up

Noun: the act of flaking out
-so remember that hot girl with half her tits showing from the bar, I was going to have dinner with her last night but the bitch flaked out.

-hot girls are flake outs as a general rule, it's supply and demand man.
by s. mooth criminal September 17, 2008
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Oct 30 Word of the Day
A trick played on a fellow athlete where the open hand smacks the target's testicles with the knuckles in a sharp, wrist flicking motion.
"Dude, I sack tapped Brandon, and now he has the whole team trying to sack tap me"
by Chris M July 07, 2004
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To cancel previously agreed upon plans last minute or just not show up.
I can't believe he would flake out! He said he would vote to advance Kavanaugh's nomination to the full Senate, however he just announced that he would support the nomination only after a delay of one week for an FBI investigation.
by GEK September 28, 2018
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To become strung out on drugs and pass out or geek out. Act like a flake. Flaking.
Ross fell off the wagon and I think he is going to "flake out" again.
by RJSlater33 September 04, 2020
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