Jisho

Oh shut up with your social justice warrior bullshit.

It's just an example sentence.

I would even call it a great example sentence that shows a form of colloquial speech you won't find in any textbooks.

Of course it's nothing you should use in your own speech, but you should be able to understand it regardless.

It is not nice to Internet bash someone who was concerned about a small example, regardless, I think the example should be changed.
I was going to recommend this site to my students for 菅字.
And there are thousands of resources for learning colloquial language online,
not all Japanese language speakers use textbooks to learn, there are many self-taught learners too who pick up phrases and words from living in Japan.

ハハハハハ！！ Sounds like someone has a personal grudge against social justice. ww

millenial speak wwwwwww

Well it's the only example sentence in the database for ムラムラ with that specific meaning so it's worth keeping, but of course for the 水着 entry anything else would also work just fine, so I don't see any reason to keep it there inside the entry if some people prefer something different. It's not like it would vanish from the site completely, so it can still be used.

Generally I think if you're concerned about the quality and about what goes into example sentences you should go directly to the Tatoeba project community and curate sentences there. Jisho.org is only one of many projects and websites using the data, all of the example sentences on here you'll also find in many other places. So by going to the source, you can influence all of these places at once instead of just one.