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Purebreed or purebred is a passive slang term referring to the child of an incestual relationship. While derogatory, the term is less caustic than that of related terms.
Dude, that girl youve been talking to might be a Purebreed..

What do you mean? She's from a higher-up family?

No, like her parents are related so her genes are 'pure.'
by JohnCore September 03, 2010