What does it mean to describe a joke as ジェネギャ?


> ジェネギャなジョーク

Need help with translating the phrase above to English. I know it is some kind
of joke and Google Translate is not helping much.




[marasai](https://japanese.stackexchange.com/users/3506/marasai) wrote in [a
comment](https://japanese.stackexchange.com/questions/23302/what-does-it-mean-
to-describe-a-joke-
as-%E3%82%B8%E3%82%A7%E3%83%8D%E3%82%AE%E3%83%A3#comment49483_23302):

> ジェネギャ is probably an abbreviation for ジェネレーション・ギャップ (generation gap).

