Also known a to have done a dunsford
To completely fuck something up, beyond recognition, usually multiple times, often in a dangerous way, but it has been know do describe any mistake made in an engineering work place.
Used mainly in engineering fields, often followed by 'cheers then' is commonly used in the UK and Europe
Believed to have originated from Rolls-Royce
Person B: ‘what? Really?!’
Person A: ‘yea it’s my seventh! I just keep doing a dunsford!’
Person B: ‘at least it’s not as bad as last time, you nearly lost an eye’
Person A: ’yea I am such a dunsford’