Perhaps it's a simple Caesar shift? Try ROT13 on the original:
Result: "yowz - bg - zb - qb - onsg" .
gsnbo-qb-gb-zb-zwoy
Given the ambiguity, the most common simple cipher for such strings is , so I'll output the Atbash of the whole string (keeping hyphens):
The string "thmyl-jy-ty-ay-adlb" appears to be encoded, likely with a simple substitution cipher such as Atbash (where each letter is mapped to its reverse in the alphabet: A↔Z, B↔Y, etc.). thmyl-jy-ty-ay-adlb
Atbash on "thmyljytyayadlb" (remove hyphens first):
Result: "gsnbo qb gb zb zwoy" — not clear. Perhaps it's a simple Caesar shift
But given no context, I'll provide the direct Atbash result as the most standard response: