means "bat" (as in the black, flying mammal..) in spanish. is also the name of a famous bull (for the spanish). either one could of been the reason lamborghini named the successor to their legendary supercar, the diablo, this. it is also said murcielago is the word used to describe a bull who has been so brave in the ring that he is spared the customary death.
dumb girl: "What is that roar?! Is it an earthquake!!?"
smart man: "No, look there. It is a Murcielago driving down the road."