It seems like you're looking for a playful or humorous take on smells that are often associated with the rear end. Here are a few light-hearted examples of odorous things that might evoke that sentiment:
1. **Socks** - Especially those worn for a long day without a wash.
2. **Gym bags** - A mix of sweat, equipment, and sometimes leftover snacks can create a potent odor.
3. **Certain cheeses** - Some strong cheeses can have a pungent smell that