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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Usage: now uncommon, largely superseded by v. tune (and tweak, hack), though none of these exactly capture sense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 ?
Another song used in the episode is Ha-Dag Nachash's "Lazuz," which gives us mevo'as, another word for feeling bummed or annoyed, as in ze lo meshane she-chavera shelcha mevo'eset, meaining "it doesn't make a difference that your girlfriend is bummed.
Continue reading "Learn, Practice, and Perfect Your Hebrew: For When You're Feeling Bummed Out" at.
I only get bummed on weekends, when I should be having fun.