Well, this is a long shot but the urine smell may sometimes come from technical urea. It's a compound found in urine that provides much of that familiar smell. It is also used as a protein denaturant in electronics cleaning.
ps:
It is also used in many shampoos....
Betel nuts are a mildly intoxicating nut that when chewed produce a very mild euphoria similar to being drunk and no, they don't cause diarrhea(notice the small point type after the previous posters statement). They do however cause intense jaw pain and tooth decay after prolonged use. In case...