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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Usage: now uncommon, largely superseded by v. tune (and tweak, hack), though none of these exactly capture sense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.
Bootilicious bottoms like Kim's, Jennifer Lopez's and Nicki Minaj's have become a big fashion asset and sparked the idea for Jessica's stunning Scrunchy Bum collection.
Never has the phrase 'does my bum look big in this?
Ulrich of the Association of Dutch Bum Centers, The Netherlands.
Bums has since spearheaded the firm's new technology programs that focus on incorporating BIM to increase productivity and integration.
That passion shown through on the field as LAPD Blue dug in against the Park Bums.
Smell my bum," is one of his most often used expressions; his catchphrase, if you will.
What makes a good bum depends on the woman and how they dress their body.
Second-degree burns are deeper skin bums, also called partial-thickness skin burns.
WOMEN in Wales are three times less likely to love their bums than those in London.
Bums was 63 at the time, and while his was not the worst problem to have, it did pose something of a dilemma.