fum = F = funky

functino n.

[uncommon, U.K.; originally a serendipitous typo in 1994] A pointer to a function in C and C++. By association with sub-atomic particles such as the neutrino, it accurately conveys an impression of smallness (one pointer is four bytes on most systems) and speed (hackers can and do use arrays of functinos to replace a switch() statement).

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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