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1.
A conservative who uses fear-mongering, smear attacks, and lying to silence or ruin the reputation of anyone who disagrees with them. Named after the infamous Senator Joseph McCarthy from 1950's
Even after the McCarthyist was caught red handed persecuting someone for practising their right to free speech, the McCarthyist still tried to play the victim.
by D.H.B. February 08, 2007
 
2.
In the United States, "McCarthyist" is what liberals call people who openly express anti-communist opinions.
I wrote a report on _The Black Book of Communism_, and my professor called me a McCarthyist.
by Gahmuret June 29, 2006