The German term “sitzpinkel” exists, which as I understand it is a mocking term for a man who sits to pee. Any Germans here who can explain the full meaning? I think the connotation is that a man who sits to pee is excessively domesticated and perhaps a bit feminine.
You pretty much got the meaning and connotation. The term is "Sitzpinkler", which translates to someone sitting while peeing. I would say that Sitzpinkler, together with Frauenvorsteher (someone who understands women) and Weichei are out of style nowadays, at least in the cities.
Hilarious burn: “someone who understands women.” Maybe it makes more sense in a previous era of take-my-wife-please humor. The kids call it Boomer Humor but I think it predates that generation.