Sl. to belittle someone; to show disrespect for someone. (From either a nonstandard transitive verb disrespect or from dismiss [as in significant]. Dis is also a slang transitive verb.) Gary is such a complainer. All he does is diss on people.Please stop dissing my little sister. She didn't do any of those things.
dis(s)
tv. to belittle someone; to show disrespect for someone. (From disrespect.) Please stop dissing my little sister. She didn’t do any of those things.