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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Usage: now uncommon, largely superseded by v. tune (and tweak, hack), though none of these exactly capture sense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 ?
I don't really think bum cleavage trousers are for me.
It's a very J-Lo type of look, but I don't think bigger women will need it, and I can't see too many thinner girls wanting to make their bum look so big.
Females questioned for the research said the ideal male bum should be smooth, hairless and blemish-free.
For we all know in our hearts that the only correct answer to the age old question, `does my bum look big in this?
Women with this bum tend to enjoy sports, although they regard themselves as traditionally feminine.
Obviously I feel disgusted when a homosexual shares the same shower and stares at one's bum with desire and even gets emotional when you are naked.
Phillip said yesterday: "I thought about getting my own bum out, but then I was offered a bum double and I decided that I'd follow in the footsteps of David Beckham and spare Holly the view from the front.
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.
May 20, 2014 /PRNewswire/ -- Sun Bum, a sun care company that's developed a cult like following since it hit the beaches in 2010, today released a smart and sexy PSA (Public Service Announcement) titled "One Night Stand.
Dubbed the padded bra for the bottom, Asda spent six months creating the miracle briefs which, they say, will make bums look rounder and more pert.