A few possibilities:
: Search results suggest that "thmyl" (ثميل) and similar terms appear in Arabic-language betting and social forums. In these contexts, "thmyl" can refer to localized nicknames or status markers within the app's community. Topic 2: Radcliffe M-HKR Review
If you are seeing "thmyl waplog mhkr verified" in a notification or a search result, it is most likely a reference to a specific (identified as thmyl or mhkr ) on the Waplog network. Waplog: Dating & Video Chat - Apps on Google Play