Jerry
From Memory Alpha, the free Star Trek reference.
"Jerry" was a slang term for a German person during World War II.
Miles O'Brien and Julian Bashir (as well as Quark) used the term when O'Brien and Bashir used their Battle of Britain holoprogram. (DS9: "Homefront", "Accession", "Looking for par'Mach in All the Wrong Places")
[edit] Quotes
"All right, all right. I'd hate to let the "Jerries" strafe that "green and pleasant land" of yours while you two were taking time outfor a drink." - Quark
"So, want to go back up and take another crack at the Jerries?" - Bashir
"And let the Jerries get across the channel, never." - O'Brien
"You know, I heard a rumor that the Jerries might be coming over the Channel tonight. Should we have a little surprise waiting for them?" - Bashir
