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Either (1) the tendency for data stored on a digital medium to decay in quality, so that the contents are corrupted or (2) the tendency for software to mysteriously stop working after a period of time, despite no changes to the code.
My coworkers were angry at me that my program stopped working. I told them, "I tested it a few weeks ago, and it worked then! The failure must be due to bit rot."
bit rot by DonaldAlan September 12, 2021
Related Words

rotten bit of luck 

Bad luck. It's using ironically about unpleasure situation.
What a rotten bit of luck ;) At least Hammond is excited!
rotten bit of luck by Gagarin December 19, 2016
Used by programmers. When a programmer writes a patch (like everything in software, made from bits) for a big project, he would want it to be merged with the project as soon as possible. If the patch is not merged and other patches are applied to the project, the patch may not apply anymore or conflict with patches added between the time the patch was written and the present.

For example, if I've written a patch for Firefox 5 years ago, I won't be able to use it to patch the current version of Firefox.

For non-geeks, compare it to a car. You and me are building a car (big project). I've made an engine (the original patch) but haven't installed it in our car yet because I didn't have the time. While I'm trying to find time to install the engine, you install some bicycle pedals (a conflicting patch). My engine won't fit anymore, it now suffers from bitrot.
I want to get this patch upstream, so that it doesn't suffer from bitrot.
bitrot by W3ird_N3rd September 24, 2010
when your member rots
i shagged shanaynay the other day n gots a bad case of da bitrots
bitrot by hank hardoner January 29, 2009

Bitrotype 

A form of racing performed by typing. It is very competitive, and only people with an average of 86+ wpm stand a chance in the unforgiving arena.
I bitrotype every day, and I've only won 3 races.
Bitrotype by slugtrot November 15, 2018

Bitrotype 

A competitive racing platform in which you use typing to place. It is very serious, and only members with an average of 82+ wpm stand a chance in the vicious arena.
I’ve been on Bitrotype for a while now, and I’ve only won 3 races.
Bitrotype by slugtrot November 16, 2018