knownothing 

a knownothing is the complete and total opposite of a know-it-all. the knownothing sustains itself in social circles by pretending to know what they are talking about and backing up their arguments with nonexistent facts, in the hopes that the individual they are dialoging with are less educated than themselves.

when confronted by a know-it-all, there natural enemy, they become belligerent and any air of wise sophistication is abandoned in favor of insults and off-subject commentary.

Cliff Claven, the most popular and relevant knownothing of his time has been quoted saying things like:

"a pig's orgasm lasts 30 minutes"

"White Out was invented by the mother of Mike Nesmith of the Monkees"

"The word samba means to rub navels together"

knownothing by Colony13 February 9, 2009

knowitall knownothing 

A person who acts like they know it all but prove they know nothing.

I paid attention to what they were saying, until i realized he was a knowitall knownothing. Then i told him to shut up.

knowitall knownothing by GrabControl May 9, 2015

know nothing know it all 

A person who knows nothing about most topics they chime in on in conversation. This person will be 16 years old with zero experience about farming and tell a farmer about crop rotation. This person will tell a European car technician what's wrong with their car, refuse to pay diagnosis, because they used to work at Chevy in the 80s, and then bitches when the car isn't fixed.

Rather than listening and increasing their knowledge they insist to run their mouth to the point where everybody is annoyed.

Tim actually gave advice to Matt Damon about how to play Jason Bourne better? What a fucking know nothing know it all.

know nothing know it all by Maiorani January 1, 2017

You don’t know nothing bout this 

A phrase used by older people when a younger person shows admiration for something from said old persons era. Commonly used in jest

Grandson: *puts on ray Charles*
Grandmother: oh baby You don’t know nothing bout this!

You don’t know nothing bout this by Therealrealrealll September 29, 2018

you know nothing john snow

this phrase was derived from tv serial game of thrones , addressed to john snow by two female characters of the serial in a state in which john acted reasonably.
A person who misses a bang bang opportunity acting like a wise ass.
A smart ass treating like a guy from 70's

having refused my girlfriend's tempting request for spending the night in bed with her, she just said you know nothing john snow.

you know nothing john snow by yousef cool April 16, 2015

Know-Nothing Conservative 

An American conservative who bases his or her political stance almost entirely on party-generated talking points, and becomes angry, insulting, or panicked when presented with verifiable fact.

Know-Nothing Conservatives: followers/fans of Sarah Palin, Ann Coulter, Glenn Beck

Know-Nothing Conservative by Silvanne January 11, 2011

know-nothing 

one who hasn't a clue about anything whatsoever

Edgars: We don't have a pro-shop, sir.

Captain Murphy: Who knows better, me or a know-nothing like you who knows nothing?!

know-nothing by Michael Belong May 12, 2009