I've mastered the fundamentals of vulgar English.
I heard a vulgar laugh from the distance.
I’ll carefully read your crude email for you when I get back to the office.
Things that are below normal products are the cheap knockoffs and bad quality items. These items are incredibly crude in their manufacturing and design. So much vulgarity!
You haven't seen this reading for 下 yet (sorry there's so many for this kanji!). Those items are so crude that you can't even tell what they're supposed to be. Honestly they all just look like statues of lumpy geckos (げ). That says it's a lamp but it looks more like a gecko looking at the sky. That chair? Definitely a bunch of geckos having a pool party. Are you sure you didn't get this stuff from a weird gecko artist?