hickey

noun, plural hick·eys.

1. Slang.
   1. a pimple.
   2. a reddish mark left on the skin by a passionate kiss.
2. any device or gadget whose name is not known or is momentarily forgotten.
3. Electricity. a fitting used to mount a lighting fixture in an outlet box or on a pipe or stud.
4. a tool used to bend tubes and pipes.

noun

1. US and Canadian informal an object or gadget: used as a name when the correct name is forgotten, etc; doodah
2. US and Canadian informal a mark on the skin, esp a lovebite
3. printing a spot on a printed sheet caused by an imperfection or a speck on the printing plate