The Smell of Asparagus Urine ChemistryViewsSpear Grass can cause a distinctive odor within your pee-pee. It is generally acknowledged that ingesting this green vegetable can cause a pungent aroma during a trip to the bathroom. If you notice an unpleasant smell following a delicious dish containing asparagus, do not be alarmed. It is merely a normal reaction that occurs physiologically. Be reassured that the smell is not dangerous and will go away gradually.