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
1 more definition
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