It's possible that:
* It's a typo: Perhaps you meant "lighter" or another related word.
* It's a code or acronym: Without more context, it's hard to decipher.
* It's a fictional invention: Maybe it's a made-up word for a unique lighter in a story or game.
To help me understand, could you provide more context?
For example:
* Where did you encounter this word?
* Do you have any other information about it?
* Are you looking for a real lighter with this name?
With more information, I might be able to help you figure out what "WEQTETJU" refers to.