/hik"ee/ , n. , pl. hickeys .
1. Slang.
a. a pimple.
b. 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. Elect. 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.
Also, hickie .
[ 1905-10; Amer.; of obscure orig.; senses under def. 1 perh. a separate word, though the development "device > defective device > defect, blemish, mark" is also possible; cf. DOOHICKEY ]