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1.
Officially: An offensive term that deliberately insults somebody's level of intelligence or education.

In slang: A person who is completely ignorant, an ass, a prik, idiot, etc.
That guy's ignoramus. I despise him.
by Jafje April 10, 2007
 
2.
A person who googles the word Ignoramus but only to find out it means "a ignorant lawyer".
Gretchen Carlson from Fox & Friends is an ignoramus of such kind.
by narpe August 24, 2010
 
3.
A person who is completely ignorant.
I cannot believe that he turned out to be such an ignoramus.
by Light Joker September 22, 2004
 
4.
1, Word, pejorative term frequently used to describe an ideological opponent who acts like he/she knows more than he/she actually does and/or argues according to obviously misinformed logic.

2, Person who has to google ignoramus to find out what it means.
She had to google ignoramus to find out what it meant
by Seriously Big Al April 29, 2009
 
5.
An extremely ignorant person who is too stupid to exist.
As in Gretchen Carlson is an ignoramus because she didn't know what ignoramus meant, so she looked it up online and said it is an ignorant lawyer.

or

Gretchen Carlson is too fucking stupid to know a simple word a 10 year old could figure out, and also too fucking stupid to look up the proper fucking definition... again... something a 10 year old could do. Gretchen Carlson is therefore an ignoramus and too fucking stupid to exist.
by Das Gimp August 25, 2010
 
6.
Someone who doesn't know something that you found out yesterday.
I can't believe that you didn't know the capital of Papua New Guinea you ignoramus!
by Stew September 16, 2004
 
7.
adj. a term pseudo-intellectuals use to try and insult people they believe are inferior. Usually the so called "ignoramus" doesn't give a fuck what the person who called them that thinks.
Joe: I think you do it this way.

Jim: Oh, Joe, you're such an ignoramus. This is a much superior way to achieve these ends.

Joe:...Will you just shut the fuck up?

Jim: Um, actually, fuck means "to have sex with", so you want me to "shut the to have sex with up" haha you're such an ignoramus.

Joe: Whatever asshole, have fun on World of Warcraft.
by #1 Manwhore January 05, 2010