humper

plural humpers

1. agentAgent noun of hump: one who humps.
2. AustraliacolloquialA humpback whale.

   [I]t was a wonder somebody in town hadn’t heard that humper bellowing, especially as the killers seemed to be taking it across Middle Head.

   1961, Tom Mead, Killers of Eden, Sydney: Angus and Robertson, page 33

   2 more examples

   The animal (says the Advertiser) was a female, about one year old, of the black species, humpbacked, and is termed in whaler's phraseology, a ‘humper’s yearling.’ It measured 50ft in length.

   1871 March 22, The Hamilton Spectator, Victoria, page 4, column 2

   The Dago element in the crew became too scared to move. Then the old humper charged. There were about twenty tons of water in that spout, and it completely enveloped him; but he did not mind.

   1920 June 12, Smith's Weekly, Sydney, page 8, column 3

   Synonyms: humpy