This is when you are about to say something that may be perceived as racist (especially towards African Americans) and you want to put the disclaimer out beforehand that it should not be taken with the racist connotation that it actually holds, but as a general comment or statement that just happens to have a slight racist tone to it.
No Paula Deen, but those Mexicans sure know how to clean a house, OR blacks really do love fried chicken and watermelon, no Paula Deen, I'm just saying....