An Emo (male/female) that thinks he/she knows everything about being Emo. When acctually, every Emo is different from the rest.
An Emo know it all would say somthing like: Emos dont listen to Taking Back Sunday.
by Gingee August 15, 2006
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a girl that is supposedly good at giving brains (blow job)
Rapper Whiz Khalifa used it in his song "Say yeah"

I came to blow it all/ And get some brains trynna find miss know it all
by danger rat February 22, 2010
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Someone who claims to have an advanced knowledge of a subject they actually know little or nothing about.
Person 1: "Hey, have you see the newest episode of House?"
Person 2: "Uh... yeah, it was awesome."
Person 1: "Have you ever even seen the show?"
Person 2: "Umm... sure... I've like... seen every episode."
Person 1: "Dude, stop being such a know-it-all wannabe."
by Shquiggles November 10, 2009
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People on FB that think they know everything and consult other FB people on religion, politics and other topics. In reality these people really don't know shit.
A Facebook know it all..... " John, the Bible never said anything about homosexuality, let me lecture you more on shit I don't know about.... "
by Alan Prokop December 23, 2013
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reffering towards a person who is in college or contains a multitude of knowledge and thinks he/she understands the world because of of it
jennifer entered medical school and think she can cure any ailment i come across. she has only been there a month. what a college know it all.
by apollo042398 August 17, 2011
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Someone whose father is an intellectual and their mother is a prostitute or simply stated; it's what you get when you cross a whore and a computer!
Fucking know-it-all: Anyone who forcibly interrupts, believes what they have to say is more important, makes more sense and is adamant more truthful than what is being presently stated by another person or persons!
by Waldo Pepper III August 3, 2019
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The opposite of a know-all; a person who behaves as if they know nothing but really is incredibly knowledgeable, to the point of causing annoyance.
"You aced the test yet talk to me as though you failed, such a patronising little know-fuck-all."
by shitstained mattress September 16, 2020
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