Badamia exclamationis or Brown awl is a butterfly belonging to the family Hesperiidae, which is found in India, Southeast Asia and Australia. It has brown wings and has light-brown abdomen with black bands across it.
Of the 4 species of skipper reported in Fiji this individual appears to be most likely to be a Badamia. Confirmation would be nice - looks like a Badamia according to TOLWEB