Here are some possibilities:
* A misspelling of "grimy": This would mean dirty or covered in dirt or grime.
* A misspelling of "gritty": This would mean rough or coarse in texture, or having a strong, harsh flavor.
* A regional slang term: It's possible that "griggy" has a specific meaning in a certain area or dialect.
To understand the meaning of "griggy" in a specific context, please provide more information about where you encountered the word.