Commentary for Avodah Zarah 134:8

For an animal to be called a “nevelah” and to be prohibited it must be something that people would eat. It must be something that if a Jew gave to a stranger, he would eat. If people would not eat it then it is not prohibited—it is no longer called nevelah. So too anything with a bad taste—if people would not eat it, then it is not prohibited for a Jew to eat it.