An archaic slang phrase meaning to be in a bad mood — angry, sullen, or just generally difficult to deal with. The 'hump' here is a figurative lump of irritability you're carrying around. Think of it as the Victorian version of 'woke up on the wrong side of the bed.' Rarely used today, but it has a satisfying bluntness to it.
Don't bother him right now — he's had his hump up all morning over the broken fence.
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(slang, archaic) To be angry or sullen.
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