get the hump
- verb to become bad-tempered, morose or offended. This common expression is at least 100 years old. The origin of this sense of hump is not clear, although it may refer straightforwardly to a hunchback’s deformity, to a back bent with care, a head dropped in gloom, or a traveller’s burden. In modern cockney usage the phrase is often abbreviated to the adjective humpty.