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1.
A term used to decribe young voters who supports many conservative and libertarian values. They believe in some Republican issues such as tax reform and opposition of hate crime legislation but have libertarian views such as free speech. Mainstream conservatives criticize South Park as being profane and crude, but the show mocks liberal issues and communicates with the Republican issues. South Park Republicans tend to be less religious than the traditional Republicans; they are more likely to share the same values with more moderate politican Arnold Schwarzenegger.
Dave from U.C. Berkley is a South Park Republican. He does not like the liberal protesters on his campus, but he collects Playboy magazines.
by Big Tone May 22, 2005
 
2.
A person who subscribes to the libertarian ideology but tends to support (within the American two-party system) the republican party due mostly to personal opposition to the democratic party. So named for the Comedy Central animated cartoon that espouses this ideal within its content.
As a libertarian, I'm not too fond of the republican party, but the democratic party is much worse. I thereby think of myself as a South Park Republican.
by Spuddie April 14, 2008