dub-dub
n.— «After the classroom training, you followed a “top ten” waiter/waitress (w/w—pronounced dub-dub) around for a week before you could even wait a table yourself.» —“Re: Monterey Bay, general ranting.” by Jeremiah McAuliffe in Pittsburgh Usenet: pgh.food Apr. 22, 2000. (source: Double-Tongued Dictionary)
Further reading
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Amid court-ordered busing in the 1970s, a middle-school teacher tried to distract her nervous students on the first day of class with this strange assignment: find a monarch caterpillar. The result? A memorable lesson in the miracle of metamorphosis...