noun, feminine/ˌmjeɾda pinˌt͡ʃada en um ˈpalo/plural: mierdas pinchadas en un palo
piece of shit (something of little or no value)
“Compré un coche usado y resultó ser una mierda pinchada en un palo.” — I bought a used car and it turned out to be a piece of shit.
Literally, “shit stuck on a stick”.