flag day = F = flamage

flaky adj.

(var sp. `flakey') Subject to frequent lossage. This use is of course related to the common slang use of the word to describe a person as eccentric, crazy, or just unreliable. A system that is flaky is working, sort of -- enough that you are tempted to try to use it -- but fails frequently enough that the odds in favor of finishing what you start are low. Commonwealth hackish prefers dodgy or wonky.

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