An outlet or hole where a hydrogen fuel cell car expels its water from, just
like how the actual private part how it will expel
pee from the body. By the way, Hydrogen cars release water as a byproduct of the chemical reaction that occurs in their fuel cells. In a hydrogen fuel cell, hydrogen
gas (H₂) combines with oxygen (O₂) from the
air. This reaction produces electricity to power the vehicle and generates water (H₂O) as a byproduct.