noun. A literal or metaphorical piece of shit, with optional frosting and an indeterminate number of layers.
Real citation: " Here's a turdcake for Mark's birthday. Can you spot the flies?"
(Jim Krewson, http://www.jimkrewson.com/cakes.html)
Made-up citation: "In my Catholic grammar school, kids had nicknames like Crud, Dorko, and Steam-umm, but there was no Turdcake. Well, we couldn't think of everything..."