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A terrible istrument consisting of two hot metal plates. Used to burn and straighten teenage girls hair, by means of taking not pin-straight hair and pressing and holding it between aforementioned hot metal plates. A favorite among the the 13-18 year old age group. Occasionally used on sexually confused young men.
Can have awful results if you don't do it exactly right. For the teenage girl who thinks that curly hair is "OmiGod! Like sooo uncool!!!"
curly-haired girl : OMG!! Jessica, do you think all the cool kids will like me if I but this $80 flat iron???
Jessica: OMG!! Yes, because curly hair is so 90's!!
Flat Iron by yourmomma May 13, 2005
When a large size person wants to have sex with a skinny person.
I wanna flat iron you tonite!
Flat Iron by Veronica Lugo May 17, 2008
guy 1:Omg why cant i score tonight
guy 2:Are you not getting owt?
guy 1:Only flat irons
guy 2: Ouchhhh
Flat Iron by Dougsey June 7, 2009

Kentucky flat iron 

When you do a hot rail of meth off of a woman who has no breasts

It's only a Kentucky flat iron if you're either in Kentucky, or she's from Kentucky
"I gave her a Kentucky flat iron and I haven't slept in 3 days!"

FLATIRON 

A neighborhood in Philadelphia located in the middle of Portrichmond and Fishtown. Also known as Portfishington, Kensington, old Richmond.
I am going to hang out in Flatiron tonight
FLATIRON by User123579 May 21, 2019

Flatirons 

Flattirons tossed jmmy salad at the drive in movie last night. Flatirons is such a suck up.
Flatirons by cpt fancy pants August 21, 2008

Flatironed 

The situation when you tell your friend to apply for a job position which you have also applied to and then your friend gets that job, and you don't!
Dave told andrew about the work position at the cool startup and then andrew got it, Dave totally got flatironed!
Flatironed by Def_coiner November 15, 2018