Language hat has a post on Japanese words loaned from English, and how they are conjugated.
Homoru is the verb form of of "homosexual", so the verb means "to be homosexual/ engage in homosexual acts [in the m/m sense] ... There's a corresponding verb for females, too, 'rezuru' (from "rezubian", the Japanese pronunciation), and even a porno movie series called Rezure! -- that's the imperative form
I like naming a film after the imperative form of the verb 'to be a lesbian'