loca
/ˈloka/ · A2 · noun · f
madwoman
loca = loco + feminine -a; think of going loco, said of a woman
English borrowed loco (crazy) straight from Spanish. Swap the masculine -o for feminine -a and you get loca: a madwoman. Colloquially it is also an insult for a promiscuous woman or an effeminate man, so use with care.