Merkin
Literally, a pubic wig. But on Usenet and other Net forums, a derisive UK and Commonwealth term for an American, caricaturing the pronunciation of "American" in some US English dialects. Plural sometimes given as "Merkinz".
UK user: "'Zucchini'? You Merkins can't get anything right, it's 'courgettes'." US user: "Well, if we weren't around, who could you Brits possibly feel superior to?"
By Leslie Doppler Hammond