noun. A dastardly thief of muffins who doesn't even care that these muffins have families!
Real citation: "Welcome back. I will send you muffins if you like, but I doubt that you will relieve them because of the New Zeland muffin napper that still hangs out around these parts."
(Tihstae , Jan. 1, 2005, http://groups-beta.google.com/group/alt.roundtable/msg/56dd7d055a50181e?hl=en&)
Made-up citation: "If a muffin-napper reads a muffin-choker while holding a muffin-walloper, then a muffin-robber is reading a sensational and probably gross newspaper story with one hand on his hoo-hoo-dilly."