Definition: A "nightly" is a bleeding edge release that is built on a daily basis, usually at night after a full day's worth of new code has been committed.
It could oftentimes be unstable and not properly tested, lacking any changelogs, but eventually evolving into alphas, betas, release candidates, and finally stable releases.
If you're looking for a way to freshen up your Optimus 2X (read: make it not suck), the team over at CyanogenMod may have something of interest for you. CM10 (Android 4.1) nightlies have officially landed for the 2X (this ROM is not compatible with the T-Mobile G2X), and you can get the first build right here.



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