(Munster)fellow(person with common characteristics)(followed by the genitive)
1939, Peig Sayers, “Inghean an Cheannaidhe”, in Marie-Louise Sjoestedt, Description d’un parler irlandais de Kerry (Bibliothèque de l'École des Hautes Études; 270) (overall work in French), Paris: Librairie Honoré Champion, page 197:
D’innis sé dhi gach a thárlaigh dó ó thúis go deireadh, mar ní raibh fhios aige ná gur pártaidhe buachalla a bhí ag cainnt leis.
He told her everything that had happened to him from start to finish, because he didn’t know that it wasn’t a fellow boy (literally ‘a partner of a boy’) who was talking to him.