"dissing" means to insult, disrespect, or belittle someone or something. It is often used when someone criticizes or mocks another person or their actions in a negative way. Full definition
I also don't hear a lot of dissing of early feminists» accomplishments, though there is a pretty strong backlash against feminism's shriller aspects. (careerdigital.com)
We have thousands of gorgeous older women in Diss looking for a young plaything, and offer a quality cougar dating service across the UK. (bemytoyboy.com)
Every time religion is brought up regardless of what it is about people start dissing on God & Jesus and whatever else they beleive to be untrue. (religion.blogs.cnn.com)