1.) a stain on clothing from mcdonald’s food.

2.) any unusually greasy, hard-to-get-out stain.

3.) generic term for an odious substance.

4.) a stain left on john mccain’s tie after fornicating with the cattle lobby.

5.) pejorative reference to john mccain
john mcstain, that mcstain upon the underwear of america, had a prominent mcstain on his red tie.

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