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plural whackers
One who, or something which, whacks. quotations examples
Joe was just about the best Australian heavyweight at the time, a very tough customer in his own right. He didn't have any science, but he was a mighty whacker.
1963, George Blaikie, Scandals of Australia's Strange Past, Adelaide: Rigby Limited, page 117
(informal) Synonym of whopper (“anything large”) examples
(informal) Synonym of whopper (“an outrageous or blatant lie”) quotations examples
But all the while Captain Amos Brown was telling whackers that would have done credit to Baron Munchausen, he was really thinking of how he was to save those whose passage to a port not named in any bills of lading looked almost certain.
1908, Morley Roberts, “The Captain of the Ullswater”, in The Blue Peter