A girl you adore and love very much, but that love is unrequited and she does not feel the same. This definition stems from 2 songs called wooden girl: one by jonatan leandoer96 and one by pino placentile. Both songs describe women they loved that did not love them same way.
βI gave her all the kisses that I could, but it only seemed you were made of woodβ lyrics to wooden girl by pino placentile
βHe is afraid that the girl might not love him for what he is, instead for what he has.β - meaning of wooden girl by jonatan leandoer96 according to genius.com