A non-specific racial slur based on the phonetic implications of the recent (as of 10/15/13) product of the same name released by Pepperidge Farms. Not specific to any race, simply used because it sounds derogatory. Also occasionally refers to someone who is/is acting racist.
"Dude, you're such a Jingo"
"Shut up, you Jingo!"
"Dude, that was such a Jingo thing to say."