So full Atbash: gmabo nou zbn ydg uib uzbi → nonsense. Another guess: ? Unlikely.
t (20) - 5 = 15 → o n (14) - 5 = 9 → i z (26) - 5 = 21 → u y (25) - 5 = 20 → t l (12) - 5 = 7 → g → “o i u t g” → “outg”? No. tnzyl mlf aym bwt fry fayr
tnzyl → g m a b o → “gmabo”? Unlikely. Maybe it's “g m a b o” = “gmabo” nonsense. So full Atbash: gmabo nou zbn ydg uib uzbi → nonsense
t (20) + 5 = 25 → y n (14) + 5 = 19 → s z (26) + 5 = 31 mod26 = 5 → e y (25) + 5 = 30 mod26 = 4 → d l (12) + 5 = 17 → q → “y s e d q” → not a word. Let’s check if it's (common on forums): t (20) - 5 = 15 → o