My brain runs through a process in a situation like this.
1. Is there meat around?
Answer: No meat has been in my apartment for several days.
2. Could there be remnants of old meat...somewhere?
Answer: There's no trash to be taken out. No meat to be found.
3. Do I smell like meat?
Answer: No.
Yet, it suddenly smells like hamburger. So, my brain continues to question...
4. Could the meat smell be from the neighbors?
Answer: Possibly. I've smelled other odors before, usually smoke. But if I can now smell their meat, that would really piss me off. I would need to then begin to cook often just to get back at them.
5. Could the meat smell be from outside?
Answer: Possibly. There is the familar sound of people chatting far away somewhere, in one of those little gardens I can see from my window, but cannot see from the street. If I were to walk downstairs all such gardens would be inaccessible. "Secret gardens." But yes, it is possible meat odors could be rising from the secret gardens three stories below me, into my window. In which case, that would SUCK if I can smell their hamburgers.
In conclusion, I cannot locate the origin of these meat odors, and can't do anything about it. Thankfully, I'm not a vegetarian. But this really icky version of meat smell is making me consider it.
