Bunting tosser
Bunting is now a commonplace term for any small decorative flags or streamers strung on a line, but its original etymology is more specific as the worsted cloth used for flags in the Navy. The term doesn't appear in Covey Crump, although that is a far from infallible source. Although the naval term, 'bunting tosser' is known across the services, and may be used as a jocular insult amongst Army signallers, its use implies that the intended is only fit for the Navy.