Slang word used in Chile. It is commonly used the same way as "
motherfucker". It literally means "the cunt(vagina) of your mother".
In the same way as the term "
motherfucker" it´s offensive use depends on the way you say it.
If somebody's messing with you:
Spanish: ¿Qué te pasa conchetumadre?
English: ¿What´s the matter
motherfucker?