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Primarily used in Britain.
1. To lock up in prison. 2. To inject an illegal drug.
Jon: Did you hear, they are gonna bang up Tom today.
Bang up by Moncole Man October 30, 2011
Perhaps exclusively used in Great Britain.

Refers to the period in which a prison inmate is confined to their cell, such as during nighttime hours.

Can also be used for a more specific personal restriction of movement - e.g: solitary confinement.

Often used by former inmates outside of the context of prison to refer to a curfew or restriction of movement in a residence. For example, a hostel for vulnerably housed people might apply a curfew at 9pm, which may appear to draw a parallel with the prison curfew system.

When used by someone outside of the prison system, it can far more generally refer to any time spent in prison at all.
“Meet me tomorrow, first thing after bang up!”

“What time is bang up?”

“Feels good to be back on the wing. I had 3 days in bang up.”

“It’s just like prison in that YMCA hostel mate. They have bang up at 9pm - every night of the week! Can’t stand it.”

“He’s been a month on the out now, but before that he was banged up for a year.”
Bang up by Rix Fix May 13, 2019

Bang Up To The Elephant 

A Victorian term originating in London in 1882, bang up to the elephant refers to something being perfect/complete/done properly.
“Let me tell you, this food is truly bang up to the elephant. Could I get the recipe?”
Bang Up To The Elephant by C L G January 31, 2021

Bang up day 

A shitty day where things went wrong
Bang up day by Wonktonkerum August 20, 2013

Bang Up Time on the Flip Top 

Something totally streetwise white guys say to their supervisors at the FFC to confuse them.
Hey Austin! Bang up time on the flip top!

voluntary bang up 

Being too scared to leave your prison cell to go on the exercise yard or landing, so you stay in your cell as much as possible.
‘Yo I heard he was riding voluntary bang up in the wok house’
‘ What a neek’