(UK): aka Docs. (a pair of) Doc(tor) Marten's, a brand of robust, "sensible" boots that regularly seem to go in and out of fashion with teenagers and particularly students, male and female alike, who want to look down-to-earth.
Alice: Howdy poddner. Say, ah juss dunn gunn got me this hiyer payer of ginn-you-ine DMs! - howja likem?!
Sarah: Why the fake American accent? Cool shoes, by the way!
Alice: Why, aren't they American?