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1.
A girl who looks hot in one setting, but ghastly in another - usually because of poor lighting.
GEORGE: So, attractive one day - not attractive the next?

JERRY: Have you come across this?

GEORGE: Yes, I am familiar with this syndrome -- she's a two face.

JERRY: (Relating) Like the Batman villain?

GEORGE: (Annoyed) If that helps you..
by Caffeine and Irony December 03, 2005
 
2.
Someone who pretends to be your friend but talks negatively about you when you're not around
I thought Kaila was my friend, but it turns out she talks shit about me behind my back, what a two-face.
by Carnalidge April 05, 2009
 
3.
A person who feels one way but acts as if they really feel another way; Joselyn.
Joselyn is a fake lying ass two face.
by warriors91 May 13, 2008
 
4.
One of Batman's oldest foes, and one of Bruce Wayne's oldest friends. His first appearance was in Detective Comics #66, in 1942.

He was once Harvey Dent, the youngest District Attorney in Gotham City's history. However, Salvatore "Boss" Maroni threw acid in his face during a trial, which hideously scarred him and fractured his psyche.

Now known as Two-Face, he has developed an obsession with duality and chance, basing his crimes around the number two, and deciding outcomes of life or death with a flip of his two headed coin, which like him, is scarred on one side.
From the private notes of Dr. Hugo Strange

Two-Face is obsessed with duality, and determined to recruit half the population of Arkham City in preparation for a bloody war against the other gangs within Arkham City. But his strategy starts and ends with a flip of his coin, adding an element of randomness to his every move.

"The world is cruel, and the only morality in a cruel world is chance. Unbiased, unprejudiced, fair."-Harvey Dent/Two-Face
by Phenomenal1 August 23, 2011
 
5.
What most people are. Like really. If everybody walked around saying what they really thought shit wouldn't get done!
Dude 1: That's a lovely new dress Mrs. Beaufort.
Mrs. Beaufort: Why thank you!
Dude 1: **whispers** Makes you look like a whale you fat cow.
Dude 2: Dude, you are such a two-face.
Dude 1: It's true!
by mikeygoodfella May 25, 2009
 
6.
TwoFaces are most likely the newest designer pills on the black market today, although mainly found in Europe, there is rumor that they will be making it to the states quite soon. The high of these temp. legal pills resembles a high dose of marijuana at first, then transforms into a more psychedelic less euphoric version of MDMA. Pills effects last up to 8 hours and they are commonly found in half red half blue capsules, they usually come with the warning not to take more than one. Witch implies a strong dose of whatever active compound(s) are present. They are not commonly sold as extacy but are similar in price, altho somewhat higher. If you would usually pay 10 - 15 for an extacy pill in your area, expect 2faces(also commonly known as 26's) to go for around 17 - 20.
"Ay man, i just got some two faces, want one? 25 bucks."

"Hell no dawg, i only pay 8 bucks for beans.."

"Bro.. this isnt extacy, its 26s, imagine smoking 4 blunts of dro to the dome then eating a mix of acid and extacy.. thats what ONE is like"

"Let me get 2.."

"Dont die, here ya go."
by Pres. February 04, 2010
 
7.
noun. A facial front and profile that look like two different people. Can make someone unattractive.
You're beer goggling man, she has a two-face! From the side she looks like Xena Warrior Princess, but from the front she looks like Roseanne Arnold!
by JackM June 08, 2005