* It's a misspelling: Perhaps you meant a different word, such as "stagger" or "stirrer".
* It's a regional dialect word: There might be a specific region or community where "Stigger" has a unique meaning.
* It's a made-up word: It could be a nickname, a fictional word from a book or film, or a term specific to a particular group or activity.
To help me understand what you mean, please provide more context. For example:
* Where did you encounter this word?
* What was the sentence or situation in which it was used?
* Did the speaker provide any further explanation?
With more information, I can try to figure out what "Stigger" might mean.