Being a backronym for "Batman's Trap romantic hotel", brothel is a place where you accidentally end up staying at — especially whilst staying in countries with a) official language that you don't understand (yet) and b) more lenient cultural attitude towards sexuality than your home country
After a long day of sightseeing in a foreign city, I accidentally booked a room at a brothel—turns out 'Batman's Trap romantic hotel' wasn’t exactly the cozy place I imagined!