The Finnish term for a fishing jig is "jigi", but I don't like this anglicanization of my native language, and thus I will forever be using "kumiluiru" (rubbery wiggly thing).
It describes the thing even to someone who has no idea what it is, or at least, they will get a mental image of something resembling a jig.
Also, searching Google for "kumiluiru" returns zero results, so does it mean I can claim credit for the invention of the word?