To ‘do bird’ is British slang for serving time in prison. Someone who has ‘done bird’ has spent a stretch inside, and the phrase is used casually among criminals, prison officers and in everyday speech to describe a custodial sentence without naming the word ‘prison’ directly. It works as a general term covering any length of sentence, from a short remand to a long stretch, and it can be put into various tenses: a person is ‘doing bird’ while inside, and will have ‘done bird’ once released. It belongs to a wider stock of British slang for imprisonment, sitting alongside other euphemisms that avoid the blunt words ‘jail’ or ‘prison’ in favour of something more coded and conversational.
What’s the origin of the phrase ‘do bird’?
The phrase comes from Cockney rhyming slang. ‘Bird’ is a shortening of ‘birdlime’, which rhymes with ‘time’, so ‘doing bird’ originally meant doing time. Wiktionary’s entry confirms this standard account, describing the phrase as “Originally Cockney rhyming slang, shortened from bird-lime for ‘time’.” Birdlime itself was a sticky substance smeared on branches and twigs to trap small birds, and its use here follows the usual pattern of rhyming slang: a longer rhyming phrase is clipped down to its first word, with the rhyme left unspoken but understood by those in the know.
Green’s Dictionary of Slang records ‘bird’ as a noun meaning a prison sentence in its own right, with ‘do bird’ glossed as serving a sentence and the related ‘throw bird’ meaning to imprison someone. The earliest print citation Green’s has traced for ‘bird’ meaning jail comes from Edgar Wallace’s 1924 novel Room 13, which uses the line “He’s just out of ‘bird’ - that’s jail.” The fact that Wallace felt the need to explain the term to his readers suggests it was still regarded as specialist, insider slang at that date rather than widely understood English, consistent with a phrase that developed among criminals and in prison circles before gradually spreading into broader use. From there, ‘bird’ and ‘do bird’ settled into the language as one of the most recognisable pieces of British prison slang still in everyday use.