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
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...
If someone’s got melon, it means they’re smart. The expression most likely arose because of the resemblance between a melon and a human head. Several other foods are associated with having brains, including a cabbage, a gourd, and even a...