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1.
some one whom you know is racist yet has not openly admitted to being racists or says they aren't racists when confronted. These people tend to use peoples correct nationalities to describe people as opposed to latin, or black, they say Colombian or Nigerian.

Closet racistism: occuring in a conversation

Brittany: Dad can i go out with G?

Doug: Oh the Mexican kid, NO! I just don't like him for you.

Brittany: why?

Doug: because i said so.
by Angela parra-samra July 14, 2008
 
2.
Someone, usually white, who is racist but will never come out publically about it because they are afraid. They tend to say the N word outloud when alone, and derive pleasure from picking on minorities. Though they would never confront a black person using racist lingo, they may act out their oppressed behavior in racist blogs or by tattooing a swastika on a region that can be hidden with casual clothes.
Jake is a closet racist, did you read his blog?
by Marcy May November 10, 2009
 
3.
Someone who tries to hide the fact that they are racist. This is often done by concealing their true thoughts by opposite behavioral patterns in the same overcompensating fashion as many closet homosexuals do.
David: I just read an alarming paper on the socioeconomic position of African Americans.

Jim: Mmm, what? Afro Americans? Sounds a bit racist to me..

David: No it isn’t, listen: analysis of several US federal statistical databases showed that African Americans are more likely to end up in prison than to end up in college. Just an alarming statistical fact.

Jim: You can’t say that! That’s racist man!

David: I think you're a closet racist.
by Gein050 October 17, 2011