[breser]

Generally a footgun is something that's designed in such a way as to be extremely likely to be used in a way that's going to cause problems for yourself.

Yes it's a play on shooting yourself in the foot, the idea is that you designed a gun designed to shoot yourself in the foot.

https://www.urbandictionary.com/define.php?term=footgun

[hinkley]

It's talking about shooting yourself in the foot, but doesn't blame the victim. For me, it's one of the better cultural changes in software development in the last five years.