> He's like the rabbit fish in Ngetmeduch, which jumps into the net (seemingly) of its own will.
i.e. He always drops by without having been invited. At one point in their life cycle the meas, a tasty, black reef fish, school close to the surface in the shallow lagoon near Ngetmeduch (Koror) and may be easily caught with the derau, a two-part net consisting of two scoop nets, one held in each hand (hence sometimes "butterfly net"). The idiom is applied to a person who habitually appears without invitation at parties or feasts.