bum

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Related to given the bum's rush: be in touch, along the lines, It Takes All Kinds, pay a visit, not a chance, pulling the strings, let her rip

bum

(1)
To make highly efficient, either in time or space, often at the expense of clarity. "I managed to bum three more instructions out of that code." "I spent half the night bumming the interrupt code." In elder days, John McCarthy (inventor of Lisp) used to compare some efficiency-obsessed hackers among his students to "ski bums"; thus, optimisation became "program bumming", and eventually just "bumming".

bum

(2)
To squeeze out excess; to remove something in order to improve whatever it was removed from (without changing function; this distinguishes the process from a featurectomy).

bum

(3)
A small change to an algorithm, program, or hardware device to make it more efficient. "This hardware bum makes the jump instruction faster."

Usage: now uncommon, largely superseded by v. tune (and tweak, hack), though none of these exactly capture sense

bum

(4)
All these uses are rare in Commonwealth hackish, because in the parent dialects of English "bum" is a rude synonym for "buttocks".
References in periodicals archive ?
The cheeky, but chilly, intruder, proudly sporting his Cambridge colours around his neck, was quickly given the bum's rush from the field of play, and the teams got back to kicking around just the one ball.
This is the state of English cricket this morning - flattened and helpless after being given the bum's rush by Australia.
So her rear has been given the bum's rush and pushed in to retirement.
A telly advert showing Manchester United star Eric Cantona in the nude has been given the bum's rush.
But it was Lithuania who were given the bum's rush inside two minutes as Scotland surged into a lightning lead.
Six of the Top Ten have been given the bum's rush but this is a poor reason for writing off the competition.
Accountants have given the bum's rush to a male strip act who were set to reveal their figures.
True Scotsmen are being given the bum's rush by bosses at a stuffy kilt hire firm.