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18.
A confusing/disappointing person whom you have misjudged as a reliable, caring friend. She can call and talk for hours about herself but the minute you speak of yourself she has to get off the phone. She asks for favors and, even if you set parameters to which she agrees at first and promises she'll abide by them, she'll use them later to excuse herself from the scheduled activity. She'll pick your brain and take the credit for your originality. She will amplify her competence. She will lie to avoid confrontation and make herself the victim when confronted. In order to quit being disappointed, I never make any plans again with the Flake.
Flake: Would you come over and help me with my riding?
Me: Okay but I will need a ride there and home.
Flake: Sure, no problem.
Me: Okay, see you tomorrow at ten.
Tomorrow at ten comes and goes. She texts me five hours later saying she had to go to the dentist. In the meantime your other friend calls to say she went riding with the Flake during the time the Flake was supposed to be at the dentist.
by christy2011 April 27, 2011
 
1.
n. An unreliable person; someone who agrees to do something, but never follows through.
1. John called in sick to work again today. He's such a flake.

2. Mary said she would do the research for our project, but it's been a week and she hasn't done a thing. She's such a flake.
by Gargouille May 29, 2005
 
2.
(verb, oftenly used with "out") - To decide not to go at the last second; To "ditch" or "bail out."
"You said we were gonna go see the movie! Don't change your mind and flake out!"

"Damn, it's been an hour since we were supposed to meet. I bet she just flaked out on me."
by Patrick March 18, 2003
 
3.
n. - someone who is unreliable.
we knew chris wouldn't show up 'cuz he's a flake.
by baron S July 20, 2005
 
4.
a person, friend, or lover that calls you, texts you, emails you, tells you, that they want to hangout and alas they just sit on their fatass and never meet you or get back to you on the reason of their absence. They are big fuckass' that will only cause you many hours of anger and frustration.
He sent me a text saying:
I am gonna see you tonight right? that is the plan?
me:
yeah, call me later and we will be together fer sure.

...................................
and later that night there is well, no meeting, no sex, and NO call.
leaving me to just say:
FUCK THAT FLAKE!!
by hissyhussy March 22, 2006
 
5.
A Frequently unreliable person who says that they will do somthing or attend somthing, but never shows. Usually this is done without notice.
"Alex isn't here yet, we need to start playing poker!... I bet he flaked again"
by John70 October 11, 2007
 
6.
A so called friend who is constantly unreliable and shady. A flake is someone who can think up an excuse for everything but their own existence. The behavior that a flake exhibits is a product of their own desire to manipulate people. A flake will find reasons to ditch a friend whenever that person wants to do something that is not on the flakes agenda. They are insidious beings they do not exhibit this behavior when you first meet them but usually much later down the line. A true flake is not the idiot that they would have you believe.
Bob secretly does not like opera, so he tells his friend to buy the tickets anyways and then does not show up. He calls the friend at the last minute and says he must study for a test. Of course it's the middle of summer vacation though, what a flake.
by JJCarnegie April 16, 2009
 
7.
Someone who pretends to be your friend but in actuality keeps you around as a last resort and makes plans with YOU but THEY end up not showing or even calling to say their not coming. Usually their always late and have an excuse for everything, most likely this person is a pathological liar as well.
First scenario:

Friend #1 "What time is dego getting here?!"
Friend #2 "Psh he ain't coming, dudes a flake!"

Second scenario:

Flakey individual: "Hey we never hang out, lets do something Sunday!"
Bitter friend: "Ok sure dego" (rolls eyes)
by Erizzle82 May 31, 2010