smark
n.— «Smart mark—(n) an informed fan, who follows the business closely, but lets his hair down to enjoy the show (also “smark”).» —“A Rowdy, Bawdy Brawl” by Alfonso A. Castillo Newsday (Long Island, N.Y.) Sept. 22, 2002. (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...