(I used to run a daily idiom thing on twitter few years ago, never had the time to continue, but I guess a weekly lexicon is easier to maintain)

Speakularity (spotted on Nautilus) : a word proposed by journalist Matt Thompson and that corresponds to the transition between a society in which "the default expectation for recorded speech will be that it’s searchable and readable, nearly in the instant." (while the default nowadays is that it's not)

Sega-core (found in Killscreen) : sub-genre of chiptune music, produced by machines with 16-bits processors (Sega Genesis in particular)

Stratocaching : evolution of geoaching (a game in which participants use a GPS receiver or mobile device to hide and seek containers, called "geocaches) with flying objects (balloons, flying capsules, etc.) dropped to earth from the sky.

Fork bomb (also called rabbit virus, or wabbit) : a denial-of-service attack wherein a process continually replicates itself to deplete available system resources, causing resource starvation and slowing or crashing the system.