A person who thinks they are all that and a bag of potato chips. They correct people all the time in an annoying, rude way.
Mother , father, and daughter are in the room.
"What is wrong." Father asked.
"I'm sick. I don't feel so good." mother answered.
"It' s not ,'I don't feel good', it's I don't feel well "daughter said.
"Don't be such a know it all" said the mother.
by sour grapes i hate kias December 31, 2016
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an offensive term for an arrogant person who professes to know everything in 1 and only one subject but in reality they know absolutely nothing in that subject.
please do not confuse a know-it-all with a pundit, or someone that is blowing fairy dust up your skirt. they are 3 completely different things.
by Sexydimma August 6, 2014
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A Know it all is an egotist or most likely prideful or egotistical type. Know it all is someone who acts and thinks they know everything constantly. And they like to argue with people a lot. If a person is argumentative and argues with you so much it makes them a stubborn person and stubborn people like that think they are right about everything. A know it all is a hardhead who thinks they are smarter than others.
Jerry is a know it all because he argues with emma because jerry thinks he knows more about science than her.
by TheAwesomeJUNK June 26, 2019
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A walking dictionary. Somebody who either has to have 2 or more definitions per word for every one definition you type, or has to have a comeback example of the word, or another way it is used.
True Know it all- Peace is also an interjection Bart, you didn't know that because it wasn't on your list of uses of the word peace, and you were dead serious when you said it.
Bart-You're being kind of hard on me don't you think? I made a list of everything but interjection for peace, and it wasn't good enough for you know it all.
by Solid Mantis September 3, 2018
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a person who often makes up facts or stories to make themselves sound or appear smarter, when in reality they come off as a true idiot. They often refer to books or movies that have to actual academic holding.
She's such a know it all, she tried telling me I needed a cup of salt to make chocolate chip cookies to bring out the flavor.
by khenderson November 29, 2010
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One given to showing off about what they know by teaching others on numerous different topics that have little relation or no relation at all to the each other or the main subject matter at hand; pedant
"I'm afraid that's not going to fix the truck, Jim. To fix a truck you have to retool it. Not that much different from fixing a television set in which you rewire the power cords. Power cords which interestingly enough came were invented in the 1800s around the same time jim crow laws were passed and The First Barbary war took place. It's interesting to note that the first law was-" "Can you tell me how to fix the truck or not, know-it-all?" snapped Jim, justifiably so.

My know-it-all father went rambling on about irrelevant shit from how to groom dogs, how to tattoo arms to how to construct a road and how to build a house instead of getting to the point about figuring out the math problem. As it turned out he didn't know how.
by Marvinforbare July 13, 2008
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one given to teaching others all the time on all sorts of topics when their information is based personal opinion presented as absolute truth; a pedagogue
"Ok, whenever you go to a party you have to wear really, really happening stuff or else no one is going to hang around you. Straw hats are what's happening. If you wear straw hats people are going to take you seriously. You also can't go wrong with sandles. Now, if you wear things like this or this you'll get beat down so it's best to just throw them out. Ok, stores! You can't go to just any place to shop. If you want to buy what you're looking for, there's only one place to go. That's over at O'Mars. Now, never, I repeat, NEVER go on the North Shore Bus. The people are going to get on your nervs on the North Shore bus and the seats are going to give you back pains. Taxis are the best way to get around in this city. If you have your hair hanging all out, all the girls are going to to be looking down their nose at you. When you want a girl to know what's going down, you have your hair in a ponytail. When you go out to eat, you want your butt to look big. You can find stuff to stick in your butt over at Omar's. It's the first thing you want to buy. Now, lesson one about boys-" "I don't have time for all this, know-it-all. I doubt all that stuff is even the case."

Some know-it-all acting like a teacher on everything instead of just shutting his mouth for two seconds.

My other attempt to describe the word know-it-all on this page was actually a description of the word "patronize" or "condescending" which is to treat someone as if they're less intelligent than you or stupid, whereas a know-it-all is a person who acts like an expert.
by know-it-all Isaac July 11, 2008
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