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1.
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
 
2.
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 06, 2014