What is Translesbian?

The term 'translesbian' has a quite complicated meaning.

It means that you were both assigned male at birth but identified as a female (Transgender woman aka. MTF (Male-to-Female) Transgender person); and also you're (now identified as a woman) exclusively attracted to women.

For short, you're a transwoman who's atrracted to women.

That is the meaning of 'translesbian'.