It looks like you’re referring to a which in the world of cybersecurity and data breaches is a text file containing a large collection of username (or email) and password combinations.
These lists are usually compiled from various past data breaches across different websites [3, 4]. 135k Combo List.txt
It means those credentials are in the public domain. If you use that password anywhere else, those accounts are at high risk. It looks like you’re referring to a which
If you found this file on your computer or saw your info in a similar list: 135k Combo List.txt
The "135k" indicates that this specific list contains approximately What is a Combo List?