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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Usage: now uncommon, largely superseded by v. tune (and tweak, hack), though none of these exactly capture sense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 ?
It would be different if your bum was big and you were doing squats to make it bigger.
MILLIONS of fans admire Kim Kardashian's incredible super-curvy bum, but Liverpool designer Jessica Stefanou has gone one step further it's inspired her to start her own swimwear business.
If you're full of the 'new year, new me' spirit and have yet to get a copy of 3 Minute Bum Blitz get yourself to Tesco at 4.30pm on Monday.
She wore only a pair of stockings and exposed her bum and everything to the cool rooftop breeze.
After that, Hedonism II will select the top 20 women to move on to the bum parade finals.
"Never has the phrase 'does my bum look big in this?' been more appropriate."
"I think if there was a competition between me, Kim Kardashian and Pippa Middleton for best bum I would come third.
"Doctor Lalloo has done lots of face lifts but hardly any bum lifts here to the best of my knowledge."
"Joe Bums is being honored for his significant efforts in promoting and advancing the use of Building Information Modeling (BIM) and interoperability in the design and construction of major steel structures," said Scott Melnick, vice president of AISC.